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What is the % change in the area of a rectangle if its

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What is the % change in the area of a rectangle if its [#permalink] New post 08 Jan 2004, 18:13
What is the % change in the area of a rectangle if its length increases by a third and its width decreases by a fourth?

a. 8.33% increase
b. 6.25% increase
c. 2.2% decrease
d. 0% increase
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Re: HOW FAST CAN U COMPUTE Q [#permalink] New post 08 Jan 2004, 18:19
sunniboy007 wrote:
What is the % change in the area of a rectangle if its length increases by a third and its width decreases by a fourth?

a. 8.33% increase
b. 6.25% increase
c. 2.2% decrease
d. 0% increase


new length = 1+1/3 = 4/3L
new width = 1-1/4 = 3/4B

no increase

~30sec
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 [#permalink] New post 08 Jan 2004, 18:20
0% increase

the fastest way is using the formula

a-b-ab/100 where a is the value that increases and b is the value that decreases. so 33.33 - 25 - 33.33* 25/100 = 0%
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 [#permalink] New post 08 Jan 2004, 18:22
:woohoo
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 [#permalink] New post 08 Jan 2004, 19:23
The fastest way: Pnew=Pold x (3/4) * (4/3).....it took me 3 seconds :-D
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Re: HOW FAST CAN U COMPUTE Q [#permalink] New post 08 Jan 2004, 19:34
dj wrote:
sunniboy007 wrote:
What is the % change in the area of a rectangle if its length increases by a third and its width decreases by a fourth?

a. 8.33% increase
b. 6.25% increase
c. 2.2% decrease
d. 0% increase


new length = 1+1/3 = 4/3L
new width = 1-1/4 = 3/4B

no increase

~30sec


I disagree dj, that took you 29.9998843443923243908239484327982734... seconds! :drinking
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Re: HOW FAST CAN U COMPUTE Q [#permalink] New post 08 Jan 2004, 19:38
haha..u can't refute, guy. I said approx (~) 30 sec.
How can I do such I mistake when I know that you are there and that you are drunk ;)
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Re: HOW FAST CAN U COMPUTE Q [#permalink] New post 08 Jan 2004, 19:40
dj wrote:
haha..u can't refute, guy. I said approx (~) 30 sec.
How can I do such I mistake when I know that you are there and that you are drunk ;)


hahaha - you got me you slick man. i misunderestimated you! :drunk
Re: HOW FAST CAN U COMPUTE Q   [#permalink] 08 Jan 2004, 19:40
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