Of the three numbers, the first is twice the second and the second is twice the third. The average of the reciprocal of the numbers is 7/72. The numbers are:
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1
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A set A consists of integers 27, 28, 30 and 33. If integer k is included in the set, the average of set A will increase by 30%. What is the value of integer k ?
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2
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30 pens and 75 pencils altogether were purchased for Rs. 510. If the average price of a pencil was Rs. 2, what was the average price of a pen ?
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3
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The average marks of four subjects is 120. If 33 was misread as 13 during the calculation, what will be the correct average?
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A man travels equal distances of his journey at 40, 30 and 15 km/h. respectively. Find his average speed for whole journey.
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5
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The mean of 25 observations was found to be 78.4. But later on it was found that 96 were misread as 69. The correct means is
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6
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If the arithmetic mean of 7, 5, 13, x and 9 is 10, then the value of x is :
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7
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If the average of x and 1/x(X\( \ne \)0) is M, then the average of x2 and 1/x^{2} is :
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8
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The average of the first five multiples of 3 is
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9
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Average of two numbers is 8 and average of other three numbers is 3; the average of the five numbers is :
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10
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The arithmetic mean of the scores of a group of students in a test was 52. The brightest 20% of them secured a mean score of 80 and the dullest 25% a mean score of 31. The mean score of remaining 55% is
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