The total mass of 2 packets of brown rice and 3 bags of red bean was 48 kg. Each bag of red bean was 4 kg lighter than each packet of brown rice.
- What was the mass of 1 packet of brown rice?
- What was the mass of 1 bag of red bean?
(a)
Mass of a bag of red bean = 1 u
Mass of a packet of brown rice = 1 u + 4
2 x (1 u + 4) + 3 x 1 u = 48
2 u + 8 + 3 u = 48
2 u + 3 u = 48 - 8
5 u = 40
1 u = 40 ÷ 5 = 8
Mass of 1 packet of brown rice
= 8 + 4
= 12 kg
(b)
Mass of 1 bag of red bean = 1 u = 8 kg
Answer(s): (a) 12 kg; (b) 8 kg