The average age of 10 children is 9 years 9 months . the average age of 9 children is 8 years 11 months. What is the age of the tenth child?
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Answered by
3
Answer:
Average age of 10 children = 9 years 9 months
sum of ages of 10 children = 9×10+912×10
= 3904
Average age of 9 children = 8 years 11 months
sum of age of 9 children = 8×9+1112×9
= 3214
Age of 10th child = 3904−3214=694
= 17 years 3 months
Answered by
5
Step-by-step explanation:
sum of ages of 10 children = 9×10+9/12 ×10 =390/4
sum of the ages 9 children =8×9+11/12×10= 321/4
age of 10th children =390/4 - 321/4 =69/4 = 17 years 3 months ..
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