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If w is 10 percent less than x, and y is 30 percent less th
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25 Mar 2019, 08:03
25 Mar 2019, 08:03
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If w is 10 percent less than x, and y is 30 percent less than z, then wy is what percent less than xz?
(A) 10%
(B) 20%
(C) 37%
(D) 40%
(E) 100%
(A) 10%
(B) 20%
(C) 37%
(D) 40%
(E) 100%
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Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: If w is 10 percent less than x, and y is 30 percent less th
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25 Mar 2019, 10:09
25 Mar 2019, 10:09
3
Carcass wrote:
If w is 10 percent less than x, and y is 30 percent less than z, then wy is what percent less than xz?
(A) 10%
(B) 20%
(C) 37%
(D) 40%
(E) 100%
(A) 10%
(B) 20%
(C) 37%
(D) 40%
(E) 100%
A quick approach is to find values that satisfy the given information.
w is 10 percent less than x
How about w = 9 and x = 10 [in other words, 9 is 10% less than 10]
y is 30 percent less than z
How about y = 7 and z = 10 [in other words, 7 is 30% less than 10]
wy is what percent less than xz?
wy = (9)(7) = 63
xz = (10)(10) = 100
The question becomes "63 is what percent less than 100?"
Answer: C [since 37% less than 100 is 63]
Cheers,
Brent
Re: If w is 10 percent less than x, and y is 30 percent less th
[#permalink]
19 Jun 2022, 18:59
19 Jun 2022, 18:59
1
GreenlightTestPrep wrote:
Carcass wrote:
If w is 10 percent less than x, and y is 30 percent less than z, then wy is what percent less than xz?
(A) 10%
(B) 20%
(C) 37%
(D) 40%
(E) 100%
(A) 10%
(B) 20%
(C) 37%
(D) 40%
(E) 100%
A quick approach is to find values that satisfy the given information.
w is 10 percent less than x
How about w = 9 and x = 10 [in other words, 9 is 10% less than 10]
y is 30 percent less than z
How about y = 7 and z = 10 [in other words, 7 is 30% less than 10]
wy is what percent less than xz?
wy = (9)(7) = 63
xz = (10)(10) = 100
The question becomes "63 is what percent less than 100?"
Answer: C [since 37% less than 100 is 63]
Cheers,
Brent
when i am taking w= 10 then x becomes 11
and lets say i take y= 10 or 20, then z becomes 13 or 26 respectively
if i take those values, i am getting a different ans,why?
