ANSWER KEY - TEST 11/7

RATIO AND PROPORTION – ANSWER KEY 1. 9 2. 15 3. 20 4. 7 : 9 5. 63,35 6. £900 7. 24 8. 300 9. 24kg 10. 21cm,35cm 11. 320km 12. 45° 13. 5 : 8 14. 2000km 15. 18cm, 24cm, 30cm

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RATIO AND PROPORTION – SOLUTIONS 1. What is the value of ‘x’ if 3 : 8 = x : 24?

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2. Find the value of ‘y’ if 12 : y = 20 : 25?

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3. Find the value of ‘x’ if 8 : x = x : 50?

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4. There are 35 boys and 45 girls in a class. What is the ratio of number of boys to number of girls?

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5. Find two numbers whose sum is 98 which are in th the ratio 9 : 5?

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300 in 10 days. How much he will earn in 30 days?

6. Aaron earns £300

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7. The cost of 4 dozens of bananas is £180.

180. How many bananas can be purchased in £90?

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8. In a college the ratio of number of boys to number of girls is 10 : 11. If there are 330 girls, how many boys are there in the college?

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9. Weight of 72 books is 144kg. What is the weight of 12 such books?

Answer………………………….. divided ed into 2 parts in the ratio 3 : 5. Find the length of each 10. A line segment 56cm is to be divid part?

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11. A car travels 240km in 15ꙆꙆ of petrol. How much distance will it travel in 20Ꙇ 20 of petrol?

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12. The earth rotates 360° about its axis in about 24 hours. By how much degree will it rotate in 3 hour?

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13. The number of milk teeth in human beings is 20 and the number of permanent teeth is 32.

Find the ratio of number of milk teeth to number of permanent teeth?

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14. An airplane covers a distance of 6000km in 6 hours. How much distance will it cover in 2 hours?

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15. The sides of a triangle are in the ratio 3 : 4 : 5. If the perimeter of the triangle is 72cm, find the length of its sides?

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