Math: right answer

[vito corleone]

pwede ba sumali lier este lawyer? hehehe my answer is 2...

matagal na ako wala sa MIT (Mapua not Malayan or Massachusetts btw) but i can still recall na you cannot simply enter all mathematical equations in your calculator unless you're certain that what you have (your calc ha) follows the golden rule "Please Excuse My Dear Aunt Sally". It stands for "Parentheses, Exponents, Multiplication and Division, and Addition and Subtraction".

the only instance you can immediately divide 48 by 2, that is without bothering on the other numbers in the equation given, is if its inside a parenthesis (48/2). that way, you can have the 288.

but that is not the case in the problem given...

likewise, i just want to share, i hope my memory serves me right, that a number followed by parenthesis does not need the * or X symbol. its automatic multiplication... my cent

mapuan. . .

register na dito

http://tsikot.yehey.com/forums/showt...=30907&page=21


pasensya na kung ot


*rene tagle, alam mo naman ang mga eng'g peeps, they know their math, but don't know how to put them in words so kailangan pang i-research. . .we all relearned something today :-)

[flakez]

yung multiplication by juxtaposition yung hinahanap kong argument if such thing exist. given that it is, 2 nga ang sagot. haha. ngayon ko lang narinig yung term na yan.

[roninblade]

anakngtinapa tuloytuloy pa pala 'tong thread hahahahaha

[chua_riwap]

hayyyyyzzz.........:popcorn: muna kayo.

[ydreph962]

so 2 ang final answer..

[jansky]

so 2 ang final answer..

nopee.. antayin mo pa sagot ni OB hehehe

[ydreph962]

sir san nyo ba nakuha yung rule na multiply muna bago divide, baka pwede malaman kung sino author ng rule na yan?:doh::doh:

stock knowledge yan bro..simpleng algebraic expression lang yan..sigurado ako sa sagot kong 2..

di ko na kayang hanapin ang libro kasi bata pa ko nung naituro samin yan..

[renzo_d10]

Hay salamat natapos din ....

Lintek ka jansky, ang init ng thread na ginawa mo ! :hysterical:

So yun, [SIZE=6]2 [SIZE=2]ang sagot. Hehehehe[/SIZE][/SIZE].

vito corleone. hahaha.

[Ry_Tower]

nagpa-poll na rin ako sa opis kung ano tamang sagot. Based on my stock knowledge (math olympiad member-interpurok division hehehe), the answer is 2.

[marg]

Parang Accounting lang yan.

Get a group of Accountants, and expect them to end up with different results.

[Ry_Tower]

Parang Accounting lang yan.

Get a group of Accountants, and expect them to end up with different results.

nice one. hehe, oks lang yan. exercise ng brain.

[donbuggy]

http://mathforum.org/library/drmath/view/54341.html

Question:

The problem was presented like this:

a = 1.56
b = 1.2
x = 7.2
y = 0.2

ax/by = ?

Here are two ways that I solved it:

1) I first rewrote the problem as [1.56(7.2)/ 1.2](0.2). Second, a was multiplied by x. The product was 11.232. Then, since no parentheses were present, I followed the order of operations and divided 11.232 by b, which was 1.2. The quotient was 9.36. Then I multiplied 9.36 by y, which was 0.2. The final answer was 1.872.

2) The other way, the first thing I did was multiply a by x. The product, which was 11.232, was set aside for the time being. Then b was multiplied by y, which gave the product of 0.24. The problem was now solved by dividing 11.232 (or ax) by 0.24 (or by) to reach a final answer of 46.8.

Can you please tell us which answer is correct and why?

Answer:

As written, your expression

ax/by

should be evaluated left to right: a times x, divided by b, times y. The multiplication is not done before the division, but both are done in the order they appear. Your first solution is right.

Some texts make a rule, as in your second solution, that multiplication without a symbol ("implied multiplication") should be done before any other operations in an expression, including "explicit multiplication" using a symbol. Following this rule, you would multiply a by x, then multiply b and y, then divide one by the other. Some (probably most) texts don't mention such a rule - but some of those may use it without saying so, which is far worse.

I don't know of a general rule among mathematicians that implied multiplication should be done before explicit multiplication. As far as I'm concerned, all multiplications fit in the same place in the order of operations. It's not an unreasonable rule, though, since it does seem that implied multiplication ties the operands together more tightly, at least visually; but the idea of Order of Operations (or precedence, as it is called in the computer world) is supposed to be to ensure that everyone will interpret an otherwise ambiguous expression the same way - so if some texts change the rules, or if people do what feels natural, the purpose has been lost.

So to answer your question, I think both answers can be considered right - which means, of course, that the question itself is wrong... The main lesson to learn is not which rule to follow, but how to avoid ambiguity in what you write yourself. Don't give other people this kind of trouble.

[phezthie]

yung multiplication by juxtaposition yung hinahanap kong argument if such thing exist. given that it is, 2 nga ang sagot. haha. ngayon ko lang narinig yung term na yan.

huling hirit...

multiplication by juxtaposition pertains to side by side values which are being multiplied first before processing the other operations...

it is performed in accordance with the automatic concatenation rule which means to eliminate or simplify the series of equation..

[D_rock_777]

ha ha ha okay na okay tong usapang ito ah.... napaisip isip ako dito ah pero ang sagot ko it must be 2...
kahit ano pang DAS ang gamitin nyo even haagen Dazs, adiDAS...

kudos to TS...

heto na lang ang narecall ko sa algebra ko.....kaya sangayon ako dito...

""likewise, i just want to share, i hope my memory serves me right, that a number followed by parenthesis does not need the * or X symbol. its automatic multiplication... my cent""

[jansky]

Parang Accounting lang yan.

Get a group of Accountants, and expect them to end up with different results.

hahaha.

pag magpapa audit ka sa accountant mo at magbabayad ka sa BIR ang ibibigay nya 2

pero pag magpapaudit ka sa accountant ng BIR ang ibibigay nya 288

[rene_tagle]

stock knowledge yan bro..simpleng algebraic expression lang yan..sigurado ako sa sagot kong 2..

di ko na kayang hanapin ang libro kasi bata pa ko nung naituro samin yan..

bro chumamba ka lang , mali ang approach mo kung bakit mo nakuha ang 2 although tumama ka sa sagot. ang argument mo kasi sa mdas or PEMDAS dapat multiply muna ang una bago division. both multiplication ang division have the same precedence, ang confusing part kasi sa equation kung one entity ba ang 2(9+3) o hindi? ang tamang sagot sa argument is "multiplication by juxtaposition", yun lang at wala nang iba! hindi ba sir vito.

parang practical exam lang sa law yan, kahit tama ang article na tinutukoy mo pero mali naman ang arguments mo, mali parin sagot mo.

[phezthie]

bro chumamba ka lang , mali ang approach mo kung bakit mo nakuha ang 2 although tumama ka sa sagot. ang argument mo kasi sa mdas or PEMDAS dapat multiply muna ang una bago division. both multiplication ang division have the same precedence, ang confusing part kasi sa equation kung one entity ba ang 2(9+3) o hindi? ang tamang sagot sa argument is "multiplication by juxtaposition", yun lang at wala nang iba! hindi ba sir vito.

OT: about OT(old testament)

naalala ko tuloy nung nasa MIT pa ako, pag alam na ang sagot because meron tip o OT of previous exams, write the answer first at the bottom of your exam paper then compute it pabalik

basta i highlight lang yung answer by means of box, circle o double underline, di na mapapansin na mali pala yung computation ginawa hehehe

[rene_tagle]

OT: about OT(old testament)

naalala ko tuloy nung nasa MIT pa ako, pag alam na ang sagot because meron tip o OT of previous exams, write the answer first at the bottom of your exam paper then compute it pabalik

basta i highlight lang yung answer by means of box, circle o double underline, di na mapapansin na mali pala yung computation ginawa hehehe

oo nga.

[jansky]

hahaha..

i conduct Survey sa mga sikat

Justin Bieber





President of the USA


Jackson


sagot nila 2 din nyahahahahah

[chua_riwap]

hahaha..

i conduct Survey sa mga sikat

Justin Bieber

President of the USA

Jackson


sagot nila 2 din nyahahahahah

flying voter yang isa dyan eh.....patay na bumoto pa.