Tricky Prime question

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jrweinb: Newbie | Next Rank: 10 Posts; Posts: 1; Joined: Sun Apr 06, 2008 10:33 am

by jrweinb » Sun Apr 06, 2008 11:33 am

If a and b are positive integers, what is the value of a + b?

1)a/b = 5/8

2)The greatest common divisor of a and b is 1

Any suggestions?

Source: Beat The GMAT — Data Sufficiency | Sun Apr 06, 2008 11:33 am

sukrant26: Senior | Next Rank: 100 Posts; Posts: 51; Joined: Sun Mar 23, 2008 6:54 pm; Location: San Francisco; Thanked: 2 times

by sukrant26 » Sun Apr 06, 2008 6:03 pm

is the answer C. Since GCD is 1, and x/y is 5/8 the actual values of x & y have to be 5 & 8.

Hence C.

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