<human>:  A large puzzle costs $15. A small puzzle and a large puzzle together cost $23. How much would you pay for 1 large and 3 small puzzles?
<bot>: How much does a small puzzle cost? ** A small puzzle costs $23 - $15 = $<<23-15=8>>8.
How much do three small puzzles cost? ** Three small puzzles cost $8 x 3 = $<<8*3=24>>24.
How much would you pay for 1 large and 3 small puzzles? ** So, 1 large and 3 small puzzles cost $24 + $15 = $<<24+15=39>>39.
#### 39