Maria is 8 years older than her brother, and the sum of their ages is 72 years. How old is her brother?
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Answer by addingup(3677) (Show Source): You can put this solution on YOUR website!
M + b = 72
M + 8 = b
therefore:
M + M + 8 = 72
solve for M:
2M + 8 = 72
2M = 64
M = 32
and her brother is 32 + 8 = 40
Answer by MathTherapy(9420) (Show Source): You can put this solution on YOUR website!
Maria is 8 years older than her brother, and the sum of their ages is 72 years.
How old is her brother?
Let her brother's age be B
Then she's B + 8
We then get: B + B + 8 = 72
2B = 64
B, or brother is: highlight_green%28matrix%281%2C4%2C+64%2F2%2C+%22=%22%2C+32%2C+years-old%29%29
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