<human>:  Marie ordered one chicken meal that costs $12, 5 packs of milk that costs $3 each, 4 apples that cost $1.50 each, and some boxes of pizza. Marie paid a total of $50. How many boxes of pizza did Marie order if each box costs $8.50?
<bot>: How much did the 5 packs of milk cost? ** Five packs of milk cost $3 x 5 = $<<3*5=15>>15.
How much did the 4 apples cost? ** Four apples cost $1.50 x 4 = $<<1.5*4=6>>6.
How much did the chicken meal, milk, and apples cost? ** The total cost of the chicken meal, milk, and apples is $12 + $15 + $6 = $<<12+15+6=33>>33.
How much did the boxes of pizza cost? ** Thus, the boxes of pizza cost $50 - $33 = $<<50-33=17>>17.
How many boxes of pizza did Marie order? ** Therefore, Marie ordered $17/$8.50 = <<17/8.5=2>>2 boxes of pizza.
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