Question

21 banana trees, 42 grapes trees and 56 papaya trees have to be planted in rows such that each row contain the same number of trees of one variety only. Minimum number of rows i which the above trees may be planted is

Answer 1

21,42,56

by LCM of (21,42,56)

21 = 3*7

42 = 3*7*2

56 = 2*7*2*2

LCM = 7*2*2*3*2= 168