What is the L.C.M. of 25, 30, 35 and 40?

Question: What is the L.C.M. of 25, 30, 35 and 40?Solution:25 = 5 × 5, 30 = 5 × 3 × 2, 35 = 5 × 7, 40 = 2 × 2 × 2 × 5Required LCM = 2 × 2 × 2 × 5 × 5 × 3 × 7 = 4200