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If 0.25 + x = y and y/x = 0.2, then y =

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Math Expert
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If 0.25 + x = y and y/x = 0.2, then y =  [#permalink]

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New post 07 Mar 2019, 02:24
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

78% (01:45) correct 22% (02:00) wrong based on 54 sessions

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Re: If 0.25 + x = y and y/x = 0.2, then y =  [#permalink]

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New post 07 Mar 2019, 06:16
Bunuel wrote:
If 0.25 + x = y and y/x = 0.2, then y =

A. -1
B. -1/2
C. -1/4
D. -1/8
E. -1/16


SOLVE for x=.2y
0.25 + x = y
y = -.0625 ~ -1/16
IMO E
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Re: If 0.25 + x = y and y/x = 0.2, then y =  [#permalink]

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New post 21 Mar 2019, 04:29
I get a different result, why??

0.25+x=y thus

y/x= 0.25+x/x=0.2

0.25/x +x/x = 0.25/x +1 = 0.2

0.25=-0.8x
x=0.25/(-0.8)=-5/16

Any clues where I went wrong?
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Re: If 0.25 + x = y and y/x = 0.2, then y =  [#permalink]

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New post 24 Mar 2019, 18:23
1
Bunuel wrote:
If 0.25 + x = y and y/x = 0.2, then y =

A. -1
B. -1/2
C. -1/4
D. -1/8
E. -1/16


We see that y = 0.2x, thus:

0.25 + x = 0.2x

0.25 = -0.8x

25 = -80x

x = 25/-80 = -5/16

So y = 0.2(-5/16) = -1/16.

Answer: E
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Re: If 0.25 + x = y and y/x = 0.2, then y =  [#permalink]

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New post 25 Mar 2019, 23:44
1
Berlin92 wrote:
I get a different result, why??

0.25+x=y thus

y/x= 0.25+x/x=0.2

0.25/x +x/x = 0.25/x +1 = 0.2

0.25=-0.8x
x=0.25/(-0.8)=-5/16

Any clues where I went wrong?


Berlin92

Question is asking y and you have found out x.
Try to find y and your answer will match OA

Thanks

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Re: If 0.25 + x = y and y/x = 0.2, then y =   [#permalink] 25 Mar 2019, 23:44
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