SOLUTION: Mollie's brother is three years younger than twice her age. The sum of their age is 24. How old is Mollie?

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Question 785335: Mollie's brother is three years younger than twice her age. The sum of their age is 24. How old is Mollie?
Answer by harpazo(655) About Me  (Show Source):
You can put this solution on YOUR website!
Mollie's brother = 2x-3
Mollie = x
The sum = x + 2x-3
The sum = 24
x + 2x-3 = 24
3x - 3 = 24
3x = 27
x = 9
Mollie is 9 years old.
Her brother is 2(9)-3 or 15 years old.