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If the ratio of y to x is equal to 3 and the sum of y and x is 80, wha

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SVP
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If the ratio of y to x is equal to 3 and the sum of y and x is 80, wha [#permalink]

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New post 06 Sep 2017, 10:44
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A
B
C
D
E

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  15% (low)

Question Stats:

79% (00:30) correct 21% (00:19) wrong based on 42 sessions

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If the ratio of y to x is equal to 3 and the sum of y and x is 80, what is the value of y?

(A) –10 (B) –2 (C) 5 (D) 20 (E) 60

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Re: If the ratio of y to x is equal to 3 and the sum of y and x is 80, wha [#permalink]

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New post 06 Sep 2017, 11:00
SajjadAhmad wrote:
If the ratio of y to x is equal to 3 and the sum of y and x is 80, what is the value of y?

(A) –10 (B) –2 (C) 5 (D) 20 (E) 60

The ratio of y to x is 3

\(\frac{y}{x} = \frac{3}{1}\) , so y = 3x

Sum of y and x is 80

x + y = 80

Substitute y = 3x

x + 3x = 80
4x = 80
x = 20

Plug in x = 20
y = 3(20)
y = 60

Answer E
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If the ratio of y to x is equal to 3 and the sum of y and x is 80, wha [#permalink]

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New post 06 Sep 2017, 12:13
From the question stem, we know \(\frac{y}{x} = 3 => y = 3x\)

x+y = 80
Substituting this value of y, 4x = 80 -> x = 20
Therefore y = 3x = 60(Option E)
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If the ratio of y to x is equal to 3 and the sum of y and x is 80, wha   [#permalink] 06 Sep 2017, 12:13
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