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Bank account A contains exactly x dollars, an amount that w

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Bank account A contains exactly x dollars, an amount that w [#permalink] New post 15 Sep 2017, 07:32
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Bank account A contains exactly x dollars, an amount that will decrease by 10% each month for the next two months. Bank account B contains exactly y dollars, an amount that will increase by 20% each month for the next two months. If A and B contain the same amount at the end of two months, what is the ratio of \(\sqrt{x}\) to \(\sqrt{y}\) ?

A. 4:3

B. 3:2

C. 16:9

D. 2:1

E. 9:4
[Reveal] Spoiler: OA

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Re: Bank account A contains exactly x dollars, an amount that w [#permalink] New post 06 Dec 2017, 16:44
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Hi,

the question translates into the following equation:
x(0.9)^2 = y(1.2)^2

0.81x = 1.44y

Sq Rootx= Sq Root y

0.09x= 0.12y

0.12/0.09 = 4/3 =>A
Re: Bank account A contains exactly x dollars, an amount that w   [#permalink] 06 Dec 2017, 16:44
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Bank account A contains exactly x dollars, an amount that w

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