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If x and y are integers, and x^-3y^-2=72^-1
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02 Apr 2024, 15:56
02 Apr 2024, 15:56
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Question Stats:
66% (01:20) correct
33% (02:12) wrong based on 9 sessions
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If x and y are integers, and \((x^{-3})(y^{-2})=72^{-1}\), then what is the value of x+y?
A. 2
B. 3
C. 5
D. 7
E. 9
A. 2
B. 3
C. 5
D. 7
E. 9
Re: If x and y are integers, and x^-3y^-2=72^-1
[#permalink]
02 Apr 2024, 20:17
02 Apr 2024, 20:17
1
1/x3*1/y2=1/72
Lets just think 72 about the multiples of 72 which can be written as cubes and sqaures
8*9 = 72
=>2^3*3^2=72
so x+y will be 5
for faster guessing use the options also
Lets just think 72 about the multiples of 72 which can be written as cubes and sqaures
8*9 = 72
=>2^3*3^2=72
so x+y will be 5
for faster guessing use the options also
gmatclubot
Re: If x and y are integers, and x^-3y^-2=72^-1 [#permalink]
02 Apr 2024, 20:17
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