Arielle sold cookies for a sports fundralser.
Chocolate Chips sold for $6.25 per box, Oreos sold
for $7.50 per box, and Nutter Butters sold for $4.75
per box Arielle made $229.75 in all, If she sold 13
boxes of chocolate chip and 6 boxes of Nutter
Butters, how many boxes of Oreos did she sell?