(i)

Common factor of 10x - 25 is 5

(ii)

Common factor of 10x - 25 is 5

(iii)

Common factor of (6y + 21) is 3

(iv)

Common factor of (3z - 24) is 3

(v) 96abc (3a - 12)(5b - 30) ÷ 144 (a - 4)(b - 6)

Common factor of (3a - 12) is 3 and common factor of 5b – 30 is 5