Which of the following numbers will completely divide (325 + 326 + 327 + 328) ?
11
16
25
30
Explanation:
(325 + 326 + 327 + 328) = 325 x (1 + 3 + 32 + 33) = 325 x 40
= 324 x 3 x 4 x 10
= (324 x 4 x 30), which is divisible by30.
Next Question
The sum of the two numbers is 12 and their product is 35. What is the sum of the reciprocals of these numbers ?