Turtle Diophantine

If you spend exactly 920 pesos, how many pizzas can you buy at @160 and @120
http://en.wikipedia.org/wiki/Diophantine_equation#Linear_Diophantine_equations
http://wiki.sugarlabs.org/go/File:Turtle_Blocks_Activity_Diophantine.ta

Update 26 September
Blank asks Does yours work ok with:

small $11
large $17
total $1000

Thanks for the alternate solution. Yes, my solution works for all (positive) integers. It uses repeat until rather than repeat 10 in the solution you supplied. If there are a large number of solutions, they will print off screen though.


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