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October 7th, 2015, 05:00 PM   #1
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Arrow Hard problem!

A bat and a ball cost one dollar and ten cents in total. The bat costs a dollar more than the ball. How much does the ball cost?
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October 7th, 2015, 07:15 PM   #2
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$\displaystyle \color{blue}{\begin{cases}x+y=1.10\\
x-y=1 \end{cases}}$
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