The total mass of 5 packets of red bean and 5 bags of rice was 50 kg. Each bag of rice was 4 kg lighter than each packet of red bean.
- What was the mass of 1 packet of red bean?
- What was the mass of 1 bag of rice?
(a)
Mass of a bag of rice = 1 u
Mass of a packet of red bean = 1 u + 4
5 x (1 u + 4) + 5 x 1 u = 50
5 u + 20 + 5 u = 50
5 u + 5 u = 50 - 20
10 u = 30
1 u = 30 ÷ 10 = 3
Mass of 1 packet of red bean
= 3 + 4
= 7 kg
(b)
Mass of 1 bag of rice = 1 u = 3 kg
Answer(s): (a) 7 kg; (b) 3 kg