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

80 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

## 1 Solution

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

solution Apr 15, 2015

Similar Puzzles
+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.

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

The average age of a family of 6 members is 22 years. If the age of the youngest member be 7 years, the average age of the family at the birth of the youngest member was?

+1 vote

Mr. Brown tells to his son David that his age was 11 times that of David's 15 year before. After two year his age would be x more than the sum of ages of his sons, here x is the present age of David. If brother of David is 8 years younger than David, then what would be the age of Mr Brown.

+1 vote

The ratio of Sohini's age to the age of her mother is 3:11. The difference of their ages is 24 years.

What would be the ratio of their ages after 3 years?