top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

What would be the new average age of the group, if few left the group and few joined in?

0 votes
173 views

The average age of 20 students is 16. 2 students of ages 17 and 13 leave the group and 2 new of ages 10 and 11 join the group. What would be the new average age of the group?

posted Apr 14, 2015 by anonymous

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

1 Answer

0 votes

20*16 = 320 is total age
New total age is 320-30+21 = 311
New average = 311/20 = 15.55

answer Apr 15, 2015 by Sreejith Pottathil



Similar Puzzles
0 votes

The average age of a group of 15 players is 23 years.
If the age of the coach be included, then the average increases by 6 months.
Find the age of the coach.

+1 vote

Five school children in pair weigh 129 pounds, 125 pounds, 124 pounds, 123 pounds, 122 pounds, 121 pounds, 120 pound, 118 pounds, 116 pounds and 114 pounds on a weighing machine.

enter image description here

What was the weight of each one of the five little girls if taken separately?

0 votes

Average score of a group of a athlete was 42 in certain event.
When a new athlete join the group and scores equal to 250% of the average score of the group, then average of a group increases by 30%.
How many athletes were there in a group before joining of a new athlete?

0 votes

The average age of 16 employee in a working for an organization is decreased by 3 months, when an employee aged 17 years replaced by a new employee.
Find the age of new employee.

0 votes

When a boy weighing 47 kg left a group, the average weight of the remaining 49 students increased by 300 g.
What is the average weight of the remaining 49 students?

...