<human>:  Jack orders 3 sandwiches that cost $5 each. He pays with a $20 bill. How much does he get in change?
<bot>: How much did the sandwiches cost? ** The cost was 3*5=$<<3*5=15>>15.
How much did Jack get in change? ** So he got 20-15=$<<20-15=5>>5 in change.
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