A bat and a ball cost $1.10 together. The bat costs $1.00 more than the ball. How much does the ball cost?
Hint: It's not 10 cents.
5 cents.
If the ball is x, the bat is x + 1.00, so 2x + 1.00 = 1.10 and x = 0.05. Ten cents is the quick answer, but then the bat would be $1.10 and the total $1.20.
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