SOLUTION: Jason is 23 years older than his sister Joan. In 18 years, he will be twice as old as Joan. How old is each of them now?

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Question 1099441: Jason is 23 years older than his sister Joan. In 18 years, he will be twice as old as Joan. How old is each of them now?
Found 2 solutions by josgarithmetic, MathTherapy:
Answer by josgarithmetic(39618) About Me  (Show Source):
You can put this solution on YOUR website!
y Jason
x Joan
system%28y=x%2B23%2Cy%2B18=2%28x%2B18%29%29

x%2B23%2B18=2x%2B36
Do the next couple or so of steps...

Answer by MathTherapy(10552) About Me  (Show Source):
You can put this solution on YOUR website!
Jason is 23 years older than his sister Joan. In 18 years, he will be twice as old as Joan. How old is each of them now?
In 18 years, Joan's age will be the difference between their ages, or 23.

Therefore, Joan's now: highlight_green%28matrix%281%2C4%2C+23+-+18%2C+%22=%22%2C+5%2C+years-old%29%29, and Jason's now: highlight_green%28matrix%281%2C4%2C+5+%2B+23%2C+%22=%22%2C+28%2C+years-old%29%29.