Question

Give me questions like 7 on ratio for primary 5

Answer 1

Here are 12 Primary 5 level ratio questions (varied types) with answers. Use them for practice.

Questions
1. Simplify the ratio 18 : 24.
2. Write the ratio of 15 blue marbles to 10 red marbles in simplest form.
3. If 3 : 5 = x : 25, find x.
4. Share 72 sweets between A and B in the ratio 5 : 3. How many sweets does each get?
5. Divide 120 into three parts in the ratio 2 : 3 : 5. Find each part.
6. The ratio of A to B is 4 : 7. If A + B = 55, find A and B.
7. There are 28 dogs and cats are in the ratio cats : dogs = 3 : 4. How many cats are there?
8. A rectangle has length : width = 7 : 2. If the width is 6 cm, find the length.
9. In a recipe sugar : flour = 2 : 5. What fraction of the mixture is sugar?
10. In a class girls : boys = 3 : 2. If there are 25 students, what percentage are girls?
11. Which ratio is larger: 3 : 4 or 6 : 9?
12. (Challenge) The ages of A and B are in the ratio 4 : 5. After 6 years the ratio becomes 7 : 8. Find their current ages.

Answers (brief workings)
1. 18 : 24 = divide by 6 → 3 : 4.
2. 15 : 10 = divide by 5 → 3 : 2.
3. 3 : 5 = x : 25 → x = 3/5 × 25 = 15.
4. Total parts = 5 + 3 = 8. Unit = 72 ÷ 8 = 9. A = 5×9 = 45, B = 3×9 = 27.
5. Total parts = 2 + 3 + 5 = 10. Unit = 120 ÷ 10 = 12. Parts = 24, 36, 60.
6. Sum parts = 4 + 7 = 11. Unit = 55 ÷ 11 = 5. A = 4×5 = 20, B = 7×5 = 35.
7. dogs correspond to 4 units = 28 → unit = 7. cats = 3×7 = 21.
8. width = 2 units = 6 → unit = 3. length = 7×3 = 21 cm.
9. sugar fraction = 2 / (2+5) = 2/7.
10. girls = (3/(3+2))×25 = 3/5×25 = 15. Percentage = (15/25)×100% = 60%.
11. 3 : 4 = 3/4 = 0.75. 6 : 9 = 6/9 = 2/3 ≈ 0.666. 3 : 4 is larger.
12. Let ages be 4x and 5x. After 6 years: (4x+6)/(5x+6) = 7/8.
8(4x+6) = 7(5x+6) → 32x+48 = 35x+42 → 48−42 = 35x−32x → 6 = 3x → x = 2.
Current ages: A = 4×2 = 8 years, B = 5×2 = 10 years.

If you want more questions of a particular type (sharing, simplifying, word problems, or harder age problems), tell me which and I’ll make a set.