Question

Swapnesh wants to mail three parcels to Three Village Schools. He finds that the postal charges are rs 42 rs 63 and rs 294 he wants to buy stamps only of one denomination find the greatest denomination of stamps he must buy to mail three packages

Answer 1

rs 21

Explanation:

We must find the greatest common factor of the three numbers, 42, 63, 294.

42 = 2 × 3 × 7

63 = 3² × 7

294 = 2 × 3 × 7²

GCF = 3 × 7 = 21

Answer: rs 21