The average weight of a family of 5 members is 60 kg. If the youngest member dies, the average weight of the family decreases by 2 kg. Find the weight o...
The average weight of (n + 1) girls is 50 kg, and the average weight of (n - 3) boys is 70 kg. If the overall average weight is 62 kg, how many boys are...
There are three numbers 'm', 'n' and 'o' such that average of 'm' and 'n' is 22, average of 'n' and 'o' is 13 and average of 'm' and 'o' is 25. Find the...
A number is such that when it is multiplied by 9, it gives another number which is as much above from 420 as the original number (itself) is below 420. ...
A hollow spherical metallic ball has an external diameter 8cm and is 1/2cm thick. The volume of the ball (in cm cube) is.
In a training group of 32 members, the average score is 60. One member with a score of 56 leaves, and 4 new members with an average score of 64 join. Wh...
- 6 students ‘P’, ‘Q’, ‘R’, ‘S’, ‘T’ and ‘U’ took part in a quiz competition. The average score of all 6 was 72 marks. The average sc...
What is the average of the squares of the first 41 natural numbers?
The average age of a group of 20 persons is found to be 26 years. Later it is found that age of two of the persons is calculated as 30 and 60 instead of...
- The average of ‘x’ numbers is 18. If 40% of the numbers are decreased by 4 and the remaining numbers are increased by 6, then find the new average of t...
