Kindly explain with explanation.
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Answer:
Given,
Average age of five members of a family = 21 years
Total ages of their family = 21×5 years
= 105 years
If the age of grandfather be included
So, family members = 5+1
= 6
the average is increased by 9 years
Average age of 6 family members = 30 years
Total age of family members =30×6 years
= 180 years
Now,
we have to find the grandfather age
According to the question
180 - 105 years
75 years
Hence,
the grandfather age is 75 years
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