The correct answer is 11.

13456
13457
13467
13567
14567

23456
23457
23467
23567
24567

34567

(The numbers 1-7 represent the 7 execs, where 1 is the CEO and 2 the CFO.)

From my point of view the easiest way to solve this question is to write down all possible solutions.

Hmm.. from my point of view the remainder could be 0, 1, 3 or 4

Is the phrasing of the question correct??

E

x = side of the square

x^2 = (x+30)(x-20)
x^2 = x^2 -20x +30x -600
x^2 = x^2 +10x -600
10x = 600
x = 60

Hence, the answer is E

I still don't get it..

OK, with z=0 or x=1 we have a solution.

But what about x=0 and z=0? Why isn't that true?


Thanks a lot!

For my point of view, there are 4 possible answers.. a) could be correct x=0 and z=0 -> 0 = 0 b) could be correct x=1 and y=1 -> 1 + z = 1 + z c) could be correct y=1 and z=0 -> x = x b) wrong x=1 or y=0 -> y+z = y + Z -> z = xz e) could be correct x=1 or z=0 -> y+z = y+z -> xy = xy

GMAT Prep Question

I can't get the following question:

If xy + z = x(y+z), which of the following must be true

x=0 and z=0
x=1 and y=1
y=1 and z=0
x=1 or y=0
x=1 or z=0

Thanks for any help on this!