The total mass of a toy car, a toy helicopter and a toy truck is 1 kg 880 g. The toy helicopter is thrice as heavy as the toy car. The toy truck is twice as heavy as the toy helicopter. Find the total mass of the toy car and the toy truck. Give the answer in kg and g.
Mass of a toy car = 1 u
Mass of a toy helicopter = 3 u
Mass of a toy truck = 6 u
Total mass = 1 u + 3 u + 6 u = 10 u

10 u = 1880
1 u = 1880 ÷ 10 = 188

Mass of the toy helicopter
= 3 u
= 3 x 188
= 564 g

Mass of the toy truck
= 6 u
= 6 x 188
= 1128 g

Total mass of the toy car and toy truck
= 188 + 1128
= 1316 g

1 kg = 1000g 

Total mass of the toy car and toy truck = 1 kg 316 g

Answer(s): 1 kg 316 g