The total mass of 5 packets of soya bean and 4 bags of green bean was 47 kg. Each bag of green bean was 4 kg lighter than each packet of soya bean.
- What was the mass of 1 packet of soya bean?
- What was the mass of 1 bag of green bean?
(a)
Mass of a bag of green bean = 1 u
Mass of a packet of soya bean = 1 u + 4
5 x (1 u + 4) + 4 x 1 u = 47
5 u + 20 + 4 u = 47
5 u + 4 u = 47 - 20
9 u = 27
1 u = 27 ÷ 9 = 3
Mass of 1 packet of soya bean
= 3 + 4
= 7 kg
(b)
Mass of 1 bag of green bean = 1 u = 3 kg
Answer(s): (a) 7 kg; (b) 3 kg