46. The average age of the mother and her six children is 12 years which is reduced by 5 years if the age of the mother is excluded. How old is the mother?
A. 40 years B. 42 years C. 48 years D. 50 years
Answer: B.
Explanation:
Therefore age of the mother
= ( 12 × 7 – 7 × 6)
