 
 <prompt> David nwetara $12 n'okpuru. O nweghị ike ịnye ya na nwoke ya Evan onye nwere $1 na-agụnyekwa ihe mere $20. Kedu ihe Evan choro n'ihu? <response>: ```Ụdị Evan nwere dị ka $1 + $12 = $13.
N'ihi na Evan nwere dị ka $20 - $13 = $7.

Ọ bụghị ọdịda 7.``` 