Average

Q1: The average age of 80 boys in a class is 15. The average age of a group of 15 boys in the class is 16 and the average age of another 25 boys in the class is 14. What is the average age of the remaining boys in the class? 

Q2: The average weight of 12 boys is 35 kg. If the weight of an adult is added, the average becomes 37 kg. What is the weight of the adult? 

Q3: In an entrance examination, Ritu scored 56 per cent marks, Smita scored 92 per cent marks and Rina scored 634 marks. The maximum marks of the examination is 875. What is the average marks scored by all the three girls together? 

Q4: In a test, a candidate secured 468 marks out of maximum marks' A:. Had the maximum marks' A' converted to 700, he would have secured 336 marks. What was the maximum marks of the test? 

Q5: The average marks in English of a class of 24 students is 56. If the marks of three students were misread as 44, 45 and 61 in lieu of the actual marks 48, 59 and 67 respectively, then what would be the correct average? 

Q6: A student on her first 3 tests received an average score of N points. If she exceeds her previous average score by 20 points on her fourth test, then what is the average score for the first 4 tests?

Q7: There are 6 consecutive odd numbers in increasing order. The difference between the average of the squares of the first four numbers and the last four numbers is 64. If the sum of the squares of the first and the last number (i.e. odd numbers) is 178, then the averages of all the six numbers is:

Q8: The average age of the family of five members is 24. If the present age of youngest member is 8 yr, then what was the average age of the family at the time of the birth of the youngest member?

Q9: The average price of 20 pens is Rs. 18 while the average price of 18 of these pen is Rs. 15.50. Of the remaining two pens, if the price of one pen is double the price of the other, what is the price of each of these two pens ? 

Q10: The average weight of a group of 75 girls was calculated as 47 kgs. It was later discovered that the weight of one of the girls was read as 45 kgs. whereas her actual weight was 25kgs. What is the actual average weight of the group of 75 girls? (Rounded off to two digits after decimal)