3 per 5 dibtambah (3 per 10 kali 4 per 15 ) =

3/5 + (3/10x4/15)
= 3/5 + 12/150
= 90/150 + 12/150
= 102/150
= 51/75
Semoga membantu

3/5 + 3/10 × 4/15 =
3/5 + 2/25
15/25 + 2/25
17/25