The total mass of 3 bags of brown rice and 3 packets of oat was 39 kg. Each packet of oat was 3 kg lighter than each bag of brown rice.
- What was the mass of 1 bag of brown rice?
- What was the mass of 1 packet of oat?
(a)
Mass of a packet of oat = 1 u
Mass of a bag of brown rice = 1 u + 3
3 x (1 u + 3) + 3 x 1 u = 39
3 u + 9 + 3 u = 39
3 u + 3 u = 39 - 9
6 u = 30
1 u = 30 ÷ 6 = 5
Mass of 1 bag of brown rice
= 5 + 3
= 8 kg
(b)
Mass of 1 packet of oat = 1 u = 5 kg
Answer(s): (a) 8 kg; (b) 5 kg