The total mass of 7 packets of green bean and 9 bags of barley was 30 kg. Each bag of barley was 2 kg lighter than each packet of green bean.
- What was the mass of 1 packet of green bean?
- What was the mass of 1 bag of barley?
(a)
Mass of a bag of barley = 1 u
Mass of a packet of green bean = 1 u + 2
7 x (1 u + 2) + 9 x 1 u = 30
7 u + 14 + 9 u = 30
7 u + 9 u = 30 - 14
16 u = 16
1 u = 16 ÷ 16 = 1
Mass of 1 packet of green bean
= 1 + 2
= 3 kg
(b)
Mass of 1 bag of barley = 1 u = 1 kg
Answer(s): (a) 3 kg; (b) 1 kg