rrampriya Wrote:If x and y are positive integers, what is the value of x + y
1. (2^x)(3^y) = 72
2. (2^x)(2^y) = 32
statement 1 leads to 1 solution for x and y :x=3,y=2
however statement 2 leads to 2 solutions: x=3,y=2 and x=1,y=4, u can also add x=2,y=3 and x=4,y=1.
Hence I selected A as my choice.
However, answer is D. How? Can someone explain? Thanks!!
Hi,
The thing is, no need to be so engraved in what is the individual value of x and y, when the question is asking about x+Y, then be it 3+2, or 4+1(as you suggested), still you are getting definite answer "5", and this is asked. Why to trouble unnecessarily when you already got the answer.
By the way , 2^(x+y) = 2^5, how come you got 4 and 1 thing?
Thanks.
Anurag.