SOLUTION: A mother is 21 years older than her new born baby . How old will the baby be when her age is 1/4 that of her mother.

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Question 963238: A mother is 21 years older than her new born baby . How old will the baby be when her age is 1/4 that of her mother.
Answer by rothauserc(4718) About Me  (Show Source):
You can put this solution on YOUR website!
let x be age of mother's baby and mother's age is x+21, then
x = (1/4)*(x+21)
4x = x+21
3x = 21
x = 7
the baby will be 7 years old when the baby is 1/4 of her mother's age