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

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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) About Me  (Show Source):
You can put this solution on YOUR website!
S=M-15
S%2BM=31
Substituting,
M-15%2BM=31
2M=46
M=23
Then,
S=23-15
S=8
I'm 23, she's 8.

Answer by addingup(3677) About Me  (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