The average age of 4 sisters is 7 years. If we add the age o

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The average age of 4 sisters is 7 years. If we add the age of mother, then the average increases by 6 years. Find the age of the mother.

[64th BPSC 2018]

A 46 years

B 39 years

C 37 years

D 47 years

E 57 years