Percentage - General Questions (2)
| 9. | In a certain school, 20% of students are below 8 years of age. The number of students above 8 years of age is of the number of students of 8 years of age which is 48. What is the total number of students in the school? |
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Answer: Option E Explanation: Let the number of students be x. Then, Number of students above 8 years of age = (100 - 20)% of x = 80% of x.
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80% of x = 48 +
| 10. | If 20% of a = b, then b% of 20 is the same as: |
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Answer: Option A Explanation:
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| 11. | If A = x% of y and B = y% of x, then which of the following is true? |
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Answer: Option E Explanation:
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| 12. | What percentage of numbers from 1 to 70 have 1 or 9 in the unit's digit? |
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Answer: Option C Explanation: Clearly, the numbers which have 1 or 9 in the unit's digit, have squares that end in the digit 1. Such numbers from 1 to 70 are 1, 9, 11, 19, 21, 29, 31, 39, 41, 49, 51, 59, 61, 69. Number of such number =14
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| 13. | A fruit seller had some apples. He sells 40% apples and still has 420 apples. Originally, he had: |
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Answer: Option D Explanation: Suppose originally he had x apples. Then, (100 - 40)% of x = 420.
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| 14. | Two students appeared at an examination. One of them secured 9 marks more than the other and his marks was 56% of the sum of their marks. The marks obtained by them are: |
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Answer: Option C Explanation: Let their marks be (x + 9) and x.
So, their marks are 42 and 33. |
| 15. | A batsman scored 110 runs which included 3 boundaries and 8 sixes. What percent of his total score did he make by running between the wickets? |
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Answer: Option B Explanation: Number of runs made by running = 110 - (3 x 4 + 8 x 6) = 110 - (60) = 50.
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