(a) A man spent ¼ of his monthly salary on rent, 2/5 on food and 1/6 on books. If he still had ¢55,000 left, what was his monthly salary?

(b)The average age of a family of eight is 30 years.

The average age of the six children in the family is 19 years.

If the mother is four years younger than the father, calculate the age of the father.