A daughter's present age is two-fifth of the age of her mother. After 8 years, she will be one-half of the age of her mother. How old is the mother at present?
Solution: Assume the mother's present age be x years. Then, the daughter's present age =(2x/5) years.
.'. (2x/5 + 8) = 1/2(x+8) <=> x=40. Hence, mother's present age is 40 years.
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