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Problems on Average

Q31. The average of marks in English for ten students was found to be 45. Later on, it was discovered that in case of one student, the marks 46 were misread as 64. The correct averaage is
(a) 43.2
(b) 45.5
(c) 49.3
(d) 53.2

Q32. The average temperature for Sunday, Monday and Tuesday was 35°C. The average temperature for Monday, Tuesday and Wednessday was 36°C. If the temperature on Wednessday be 37°C, find the temperature on Sunday ?
(a) 33°
(b) 34°
(c) 35°
(d) 36°

Q33. The average of five numbers is 26. If one number is excluded, the average become 28. Find the excluded number.
(a) 14
(b) 15
(c) 17
(d) 18

Q34. If the average of x numbers is y2 and that of y number is x2, then the average of (x+y) number is
(a) x + y
(b) xy2
(c) xy
(d) (xy)2

Q35. The average of 6 numbers is 30. If the average of first four is 25 and that of last three is 40, the fourth number is ?
(a) 30
(b) 35
(c) 40
(d) 45



Q36. What is the least number to be added to 235 to make it a perfect square ?
(a) 14
(b) 15
(c) 17
(d) 21

Q37. What is the least number to be substructed from 235 to make it a perfect square ?
(a) 7
(b) 10
(c) 15
(d) 17

Q38. If a = √5 + √5 + √5 + ...... α , then what is the value of a
(a) 2.29
(b) 3.19
(c) 3.82
(d) 4.10

Q39. What is the smallest number by which 6750 must be divided to make it a perfect cube ?
(a) 2
(b) 3
(c) 4
(d) 5

Q40. Number of digits in the square root of 625686734489 is
(a) 5
(b) 6
(c) 8
(d) 9



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