Two quarter-pounder burgers cost $3.20 x 2 = $<<3.20*2=6.40>>6.40.

Two large fries cost $1.90 x 2 = $<<2*1.9=3.80>>3.80.

Two milkshakes cost $2.40 x 2 = $<<2*2.4=4.80>>4.80.

The total amount spent for the burgers, fries, and shakes is $6.40 + $3.80 + $4.80 = $<<6.4+3.8+4.8=15>>15.

Therefore, he should order $18 - $15 = $<<18-15=3>>3 worth of additional food to take advantage of the free food delivery.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A fast-food chain offers free delivery for a minimum purchase of $18. Danny ordered 2 quarter-pounder burgers for $3.20 each, 2 large fries that cost $1.90 each, and 2 milkshakes that cost $2.40 each. How much more worth of food should he order to avail of the free delivery?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
3
A fast-food chain offers free delivery for a minimum purchase of $18. Danny ordered 2 quarter-pounder burgers for $3.20 each, 2 large fries that cost $1.90 each, and 2 milkshakes that cost $2.40 each. How much more worth of food should he order to avail of the free delivery?
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