Question

Find the greatest number which will divide 39 and 84 so as to leave remainder

Answer 1

33–3 = 30

168–3 = 165

Prime factors of

30 = 2x3x5

165 = 3x5x11

HCF = 3x5 = 15.

So the answer is 15.

Check: 33/15 = 2 as quotient and 3 as remainder. Correct.

168/15 = 11 as quotient and 84 as remainder. Correct.

hope it helps