Mr Lim poured 45 kg of rice into two containers in the ratio 4 : 5. How much more rice was in the larger container than in the smaller container?
- 5 kg
- 9 kg
- 20 kg
- 25 kg
Need a hint?
Find the value of one unit first, then work out how many units the difference between the two containers represents.
Worked answer
- Total units = 4 + 5 = 9 units
- 1 unit = 45 kg ÷ 9 = 5 kg
- Difference in ratio = 5 − 4 = 1 unit
- Difference = 1 unit = 5 kg
Answer: 5 kg
The mistake this question tests
Habit
Stopped at one part in ratio
Pupils often take the ratio total (9) as the answer, or find the amount in one container instead of the difference between the two.
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See the answer →Practise PSLE ratio until the mistakes stop.
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