Question

three pieces of timber 42m, 35m,63m long have to be divided into the planks of the same length. what is the greatest possible length of each plank

Answer 1

three pieces of wood-42m,35m and63m
find the HCF of all three
42=2 x 3 x7
35=5 x 7
63=3x 3 x 7
7 is common in all
therefore,7 is the HCF
so,the greatest possible length of each