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MGMAT Test

by BastiG » Fri Aug 27, 2010 8:03 pm
If x, y and z are integers, what is y - z?

(1) 100^x = (2^y)(5^z)
(2) 10y = (20^x)(5^(z+1))

OA after discussion.
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Source: — Data Sufficiency |
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by pradeepkaushal9518 » Fri Aug 27, 2010 9:31 pm
100^x=(4*25)^x=4^x.25^x=2^2x.5^2x=2^y.5^z

Y=2x z=2x y-z=0

1.suff


10y=(20^x)(5^(z+1)

10y=20^x(5.5^z)=4^x.5^x(5.5^z)=4^x5.5^(x+z)

2. not sufficient

imo A
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