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If the length of a rectangle is increased by 25% and the width is decr
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29 Mar 2023, 03:25
29 Mar 2023, 03:25
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0% (00:00) wrong based on 7 sessions
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If the length of a rectangle is increased by 25% and the width is decreased by 20%, what is the change in the area of rectangle?
20% decrease
10% decrease
5% decrease
0%
5% increase
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20% decrease
10% decrease
5% decrease
0%
5% increase
Post A Detailed Correct Solution For The Above Questions And Get A Kudos.
Question From Our Project: Free GRE Prep Club Tests in Exchange for 20 Kudos
\(\Longrightarrow\) GRE - Quant Daily Topic-wise Challenge
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Re: If the length of a rectangle is increased by 25% and the width is decr
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29 Mar 2023, 21:25
29 Mar 2023, 21:25
1
As L and W are not given and we can assume it to 100 for both for easy calculation
Initial L = 100, W = 100 , Area = 10000
Final L = 125, W = 80 , Area = 10000
Another method:
Assume both for 100 now 25% increment = 5/4 and 20% decrement = 4/5
Area = 5/4 * 4/5 = 1 so no change
Note:
We need to assume proper numbers for faster calculation.
For if the question was asked for increment of 11.11% == 10/9 in fraction and decrement of 9.09% == 10/11 in fraction then our assumption values of L and W should be 99x and 99y. Now final values will be L = 110x and W = 90y
Initial L = 100, W = 100 , Area = 10000
Final L = 125, W = 80 , Area = 10000
Another method:
Assume both for 100 now 25% increment = 5/4 and 20% decrement = 4/5
Area = 5/4 * 4/5 = 1 so no change
Note:
We need to assume proper numbers for faster calculation.
For if the question was asked for increment of 11.11% == 10/9 in fraction and decrement of 9.09% == 10/11 in fraction then our assumption values of L and W should be 99x and 99y. Now final values will be L = 110x and W = 90y
gmatclubot
Re: If the length of a rectangle is increased by 25% and the width is decr [#permalink]
29 Mar 2023, 21:25
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