Posted by Kaloy on Thursday, August 9, 2012 at 8:27am.
Let r=amount of money in dollars Mr. R has
and
x=cost of each orange
We will set up the equations
15x=r+90
10x=r-60
You can then solve for r and x by the method of elimination, substitution, or comparison.
Buying 5 more oranges costs an extra $150. Therefore they cost $30 each.
Buying ten oranges costs $300 and leaves him with $60. Therefore he started out with $360.
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