A merchant has three different types of milk: 435 liters, 493 liters and 551 liters. Find the least number of casks of equal size required to store all the milk without mixing.

A. 51
B. 61
C. 47
D. 45

Explanation:

HCF of 435, 493, 551 = 29

(453/29) + (493/29) + (551/29) = 51