If d is a positive integer, is (d)^1/2greater than 15?
(1) d is divisible by 25.
(2) d is divisible by 40.
(1) d is divisible by 25.
(2) d is divisible by 40.
Charged up again to beat the beast 
(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
