The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observation is -
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1
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The average age of 30 students is 9 years. If the age of their teacher is included, the average age becomes 10 years. The age of the teacher (in years) is :
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2
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The average of 20 students is 12 years, if the teacher's age is included, average increases by one. The age of the teacher is:
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3
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Find the average of all prime numbers between 30 and 50.
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4
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A passenger travels from Delhi to Merut at a speed of 30 kmph and return with a speed of 60 kmph. What is the average speed?
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5
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In a school with 600 students, the average age of the boys is 12 years and that of the girls is 11 years. If the average of the school is 11 years 9 months, then the average the number of girls in the school is :
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6
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If the average of x and 1/x(X\( \ne \)0) is M, then the average of x2 and 1/x2 is :
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7
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Out of four numbers the average of the first three is 16 and that of the last three is 15. If the last number is 20, than first number is :
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8
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There were 35 students in a hostel. Due to the admission of 7 new student, the expenses of the mess were increased by Rs. 42 per day, while the average expenditure per head diminished by Re 1. What was the original expenditure of the mess?
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9
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Five years ago, the average age of P and Q was 25. The average age of P, Q and R today is 25. Age of R after 5 years will be :
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10
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19 people went to a hotel for combine dinner party 13 of them spent Rs. 79 each on their dinner and rest spent 4 more than the average expenditure of all the 19. What was the total money spent by them.
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