 
 <prompt> Yanna jiri iri atọ na asatọ butter cookies na iri atọ na asatọ biscuits na ụtutu. Na ọsọ, o jiri iri atọ na asatọ butter cookies na iri atọ na asatọ biscuits. Kedu ihe ọ bụla biscuits o jiri kwesịrị butter cookies? <response>: Nke a bụ 20 + 10 = 30 butter cookies.
N'ihi na, nke a bụ 40 + 20 = 60 biscuits.
N'ime ka, o nwere ike iji 60 - 30 = 30 biscuits nwepụtara butter cookies.

Ọ bụghị ịgụ 30. 