Question

Let X be the least number which when divided by 15, 18, 20, 27 the reminder in each case is 10 and X is a multiple of 31. What least number should be added to X to make it a perfect square ?

• A. 36
• B. 37
• C. 39
• D. 43

Answer 1

Answer:

C. 39

LCM of 15, 18, 20, 27 is 540. X = 540K + 10 = 540 × 4 + 10 = 2160 + 10 = 2170 least number should be added to X to make it a perfect square = 39