Jawapan

2016-03-17T11:02:36+08:00
Twins' age = S - 5
(S = Sister's Age)

S(S - 5)² = S + S - 5 + S - 5 + 4450

S(S - 5)² = 3S - 10 + 4450

S(S - 5)² = 3S + 4440