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 October 7th, 2015, 05:00 PM #1 Newbie   Joined: Oct 2015 From: sacramento Posts: 7 Thanks: 0 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?
 October 7th, 2015, 07:15 PM #2 Senior Member     Joined: Apr 2014 From: Europa Posts: 584 Thanks: 177 $\displaystyle \color{blue}{\begin{cases}x+y=1.10\\ x-y=1 \end{cases}}$

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