There are 30 students in a class.the average age of first 10 student is 12.5 years.The average age of the next 20 students is 13.1 years.the average age of whole class is?
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Answered by
4
Answer:
Total of 10 students = 12.5x10=125
Total of 20 students = 13.1x20 =262
Total age of 30students = 387 yrs
Average=387/30=I2.9 yrs
Answered by
1
Answer:
12.9
Step-by-step explanation:
let,
total age of 10 students=x
x/10=12.5
=12.5*10=125
total age of 20 students=y
y/20=13.1
=13.1*20=262
Total age of 30 students=125+262=387
Average age of 30 students=387/30=12.9
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