Question

the average age of 4 sister is 7 years is the age of the mother is included the average is increased by 6 years find the age of the mother​

Answer 1

Average age of four sisters = 7. Then, average will remain 7 for four sisters & mother combined. But inclusion of mother results in increase in average by 6, i.e, the total age increases by 6 x 5 = 30.

Answer 2

Step-by-step explanation:

The average age of four sisters is 7 years. So the new average will be 7 + 6 = 13 years for 5 members (4 sisters+mother). So total age of 5 members (4 sisters+ mother)= 5×13 = 65 years. So the mothers age is 37 years.

Hope it will help