Ratio and Proportion - General Questions
| 1. | In a bag, there are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3. If there is Rs. 30 in all, how many 5 p coins are there? |
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Answer: Option C Explanation:
Let the number of 25 p, 10 p and 5 p coins be x, 2x, 3x respectively.
Hence, the number of 5 p coins = (3 x 50) = 150. |
x =| 2. | Two number are in the ratio 3 : 5. If 9 is subtracted from each, the new numbers are in the ratio 12 : 23. The smaller number is: |
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Answer: Option B Explanation:
Let the numbers be 3x and 5x.
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23(3x - 9) = 12(5x - 9)| 3. | The fourth proportional to 5, 8, 15 is: |
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Answer: Option B Explanation:
Let the fourth proportional to 5, 8, 15 be x. Then, 5 : 8 : 15 : x
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| 4. | If 40% of a number is equal to two-third of another number, what is the ratio of first number to the second number? |
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Answer: Option C Explanation:
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| 5. | The salaries A, B, C are in the ratio 2 : 3 : 5. If the increments of 15%, 10% and 20% are allowed respectively in their salaries, then what will be new ratio of their salaries? |
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Answer: Option C Explanation: Let A = 2k, B = 3k and C = 5k.
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| 6. | If Rs. 782 be divided into three parts, proportional to |
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Answer: Option D Explanation: Given ratio =
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:
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| 7. | The sum of three numbers is 98. If the ratio of the first to second is 2 :3 and that of the second to the third is 5 : 8, then the second number is: |
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Answer: Option B Explanation: Let the three parts be A, B, C. Then,
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| 8. | If 0.75 : x :: 5 : 8, then x is equal to: |
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Answer: Option B Explanation: (x x 5) = (0.75 x 8) |