The total mass of 5 bags of red bean and 9 packets of sesame seed was 39 kg. Each packet of sesame seed was 5 kg lighter than each bag of red bean.
- What was the mass of 1 bag of red bean?
- What was the mass of 1 packet of sesame seed?
(a)
Mass of a packet of sesame seed = 1 u
Mass of a bag of red bean = 1 u + 5
5 x (1 u + 5) + 9 x 1 u = 39
5 u + 25 + 9 u = 39
5 u + 9 u = 39 - 25
14 u = 14
1 u = 14 ÷ 14 = 1
Mass of 1 bag of red bean
= 1 + 5
= 6 kg
(b)
Mass of 1 packet of sesame seed = 1 u = 1 kg
Answer(s): (a) 6 kg; (b) 1 kg