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by maihuna » Sun Aug 30, 2009 8:04 am
If d is a positive integer, is (d)^1/2greater than 15?

(1) d is divisible by 25.
(2) d is divisible by 40.
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by PussInBoots » Sun Aug 30, 2009 9:59 am
(1) & (2) alone insuff

(1) + (2): let's find least common multiple

25 = 5 * 5; 40 = 5 * 2 * 2 * 2
LCM = 5 * 5 * 2 * 2 * 2 = 200

if d = 200, sqrt(200) < 15
if d = 2000, sqrt(2000) > 15

E
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