Question 419685
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500 tickets for a football game were sold and the total receipts were $105. 
Some of the tickets sold for $15 and the rest sold for 25cents. Find the number of each sold. 
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x at  0.25 dollars each
y at  15 dollars each


{{{system(x+y=500,0.25x+15y=105)}}}


{{{system(x+y=500,x+60y=420)}}}

Subtract first equation from second equation.

{{{59y=-80}}}

Something is wrong in the problem's description.  
You should need positive whole numbers results for x and y.