139pon + 15 ons= ........kg

139 pon + 15 ons
69,5 kg + 1,5 kg
71 kg

1 pon = 5 ons

139 ÷ 5 = 27.8
27.8+15=42.8

1 ons = 100g

42.8×100=4.280

1 kg = 1000 g

4.280÷1000 = 4.28 kg