Question

Kindly explain with explanation.​

Answer 1

Answer:

b

Step-by-step explanation:

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Answer 2

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