300 ons + 5000 g = ...kg +...kg =...kg

300 ons + 5000 g = ... kg + ... kg = ... kg

1 kg   = 10 ons
1 kg   = 1000 g

300 ons = 300 : 10 = 30 kg
5000 g   = 5000 : 1000 = 5 kg

maka, 300 ons + 5000 g = 30 kg + 5 kg = 35 kg

300 ons = 3kg
5000g = 5kg
30+5= 35kg