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The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the

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The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the  [#permalink]

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New post 18 Jun 2019, 00:05
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A
B
C
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E

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Question Stats:

86% (01:54) correct 14% (02:07) wrong based on 51 sessions

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Re: The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the  [#permalink]

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New post 18 Jun 2019, 00:16
Bunuel wrote:
The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the ratio of y to z is 1 to 3, what is the ratio of w + x to z ?

A. 6:1
B. 8:1
C. 10:1
D. 24:1
E. 30:1



w/x = 5/4 = 40/32

x/y = 8/1 = 32/4

y/z = 1/3 = 4/12

w : x : y: z = 40 : 32: 4: 12

put a common unit to the ratio.

w + x = 40m + 32m = 72m

z = 12m

Required Ratio: w + x / z = 72m / 12m = 6/1.

A is the correct answer.
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Re: The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the  [#permalink]

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New post 18 Jun 2019, 01:27
Bunuel wrote:
The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the ratio of y to z is 1 to 3, what is the ratio of w + x to z ?

A. 6:1
B. 8:1
C. 10:1
D. 24:1
E. 30:1


w/x=5/4; 4w=5x
x/y=8/1; x=8y
y/z=1/3; 3y=z

Multiply x=8y by 5 to get 5x=40y; to get y equal on all equations multiply by 3 to equation 1 and 2 + 40 to Equation 3; 12w=15x=120Y=40Z; Convert the (W+X)/Z to X using the above and arrive at 6 so IMO A
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Re: The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the  [#permalink]

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New post 18 Jun 2019, 04:52
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Bunuel wrote:
The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the ratio of y to z is 1 to 3, what is the ratio of w + x to z ?

A. 6:1
B. 8:1
C. 10:1
D. 24:1
E. 30:1


given
w:x;5:4
x/y=8:1
y/z=1/3
solve
w+x/z= 18y/3y ; 6:1
IMO A
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Re: The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the  [#permalink]

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New post 18 Jun 2019, 11:51
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Re: The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the  [#permalink]

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New post 21 Jun 2019, 11:40
Bunuel wrote:
The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the ratio of y to z is 1 to 3, what is the ratio of w + x to z ?

A. 6:1
B. 8:1
C. 10:1
D. 24:1
E. 30:1


We can make the ratio of w to x as 10 : 8.

Since the ratio of x : y = 8 : 1, we have:

w : y = 10 : 1

We also have y : z = 1 : 3

Thus, w : z = 10 : 3

Therefore:

w : x : y : z = 10 : 8 : 1 : 3

So w + x : z is 18 : 3 = 6 : 1.

Answer: A
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Re: The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the  [#permalink]

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New post 21 Jun 2019, 12:18
Bunuel wrote:
The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the ratio of y to z is 1 to 3, what is the ratio of w + x to z ?

A. 6:1
B. 8:1
C. 10:1
D. 24:1
E. 30:1



w/x = 5/4 ----> 1
X/y = 8/1 ----> 2
Y/z = 1/3 ----> 3

(W + x)/z = ??

Value of x from 1 is 4k (where k is constant) and from 2 is 8k.
Since value of Y from 2 and 3 is (k), lets multiply and divide 1 by (2) so as to make the value of x as 8k.

Therefore, now new value is
W/x = 10/8

(W+x) = (10+8)k = 18k
Z = 3k

(W+x) / z = 6

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Re: The ratio of w to x is 5 to 4. The ratio of x to y is 8 to 1. If the   [#permalink] 21 Jun 2019, 12:18
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