The average age of a group of 12 students is 20years.

The average age of a group of 12 students is 20years. If 4 more students join the group, the average age increases by 1 year. The average age of the new students is

Quiz

Answer/Solution

24

Steps/Work

total age of 12 std=20*12
total age of 16 std=21*16
total age of 4 std=(21*16)-20*12=96
avg of 4 std =(96)/4=24
ANSWER:C

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The average age of a group of students is years. If more students join the group, the average age increases by year. The average age of the new students is

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