SOLUTION: My sister is 15 years older than I am. The sum of our ages is 31. Find our ages

Question 1056536: My sister is 15 years older than I am. The sum of our ages is 31. Find our ages
Found 2 solutions by Fombitz, addingup:
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

Substituting,

Then,

I'm 23, she's 8.

Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
Let's call your age x:
x+x+15 = 31
2x = 16
x = 8 you are 8, and your sister
31-8 = 23 your sister is 23.
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Check, substitute for x:
8+8+15 = 31 Correct
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