SOLUTION: Joan is three years older than her sister margaret, the sum of their ages is 45. What is joans age?

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Question 831275: Joan is three years older than her sister margaret, the sum of their ages is 45. What is joans age?
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
1.J=M%2B3
2.J%2BM=45
Substitute eq. 1 into eq. 2,
%28M%2B3%29%2BM=45
2M%2B3=45
2M=42
highlight%28M=21%29
Then from eq. 1,
J=M%2B3
highlight%28J=24%29