70 ons - 30 ons + 60 ons = .... kg

Pembahasan :

Kg
Hg = Ons

Naik : 10
Turun x 10

= 70 Ons = 70 : 10 = 7 Kg
= 30 Ons = 30 : 10 = 3 Kg
= 60 Ons = 60 : 10 = 6 Kg

= 7 - 3 + 6
= 10 Kg