The total mass of 3 packets of brown rice and 4 bags of flour was 33 kg. Each bag of flour 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 flour?
(a)
Mass of a bag of flour = 1 u
Mass of a packet of brown rice = 1 u + 4
3 x (1 u + 4) + 4 x 1 u = 33
3 u + 12 + 4 u = 33
3 u + 4 u = 33 - 12
7 u = 21
1 u = 21 ÷ 7 = 3
Mass of 1 packet of brown rice
= 3 + 4
= 7 kg
(b)
Mass of 1 bag of flour = 1 u = 3 kg
Answer(s): (a) 7 kg; (b) 3 kg