If a and b are consecutive positive integers, and ab = 30x, is x an integer?

This topic has expert replies
Moderator
Posts: 2205
Joined: Sun Oct 15, 2017 1:50 pm
Followed by:6 members

Timer

00:00

Your Answer

A

B

C

D

E

Global Stats

Source: Manhattan Prep

If a and b are consecutive positive integers, and ab = 30x, is x an integer?

1) a^2 is divisible by 25
2) 63 is a factor of b^2

The OA is C