42. A person's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present ?
A. 32 years B. 36 years
C. 40 years D. 48 years
Answer:
Let the mother's present age be x years.Then, the person's present age = (2/5 x) years.
Therefore =[2/5x+8]
= 1/2(x+8)
= 2(2x+40)
=5(x+8)
= 40 years.
