Source: Official Guide for GMAT Review 2016 Data Sufficiency ; #94
Nha Ha
First simplify the equation so that 4 has the same base as 2. Then you have x+y = 16.
From here you can use the given statements to find that the answer is B.
Dec 29, 2015 • Comment
Cydney Seigerman, Magoosh Tutor
Yes, great set-up! As you said, we can rewrite 4^8 so that the two expressions have the same base of 2:
2^(x+y) 4^8 = (2^2)^8 = 2^16
From there, we have 2^(x+y) = 2^16 and therefore x+y=16.
:)
Dec 30, 2015 • Reply
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