 
 <prompt> ```Akwụkwọ Miss Grayson gara $50 maka njem field trip ha. Site na ihe ndị akwụkwọ ya gara $5 nke ọ bụla. Ha nwere ọkwa 20 ndị akwụkwọ na akwụkwọ ya, ma ozi nke njem bụ $7 maka ọ bụla ndị akwụkwọ. Mgbe ọ bụla ihe njem field trip gara, onye ozo bụ ihe gbanwere na aka Miss Grayson?``` <response>: ```Ọrụ ndị akwụkwọ gara aga bụ $5 x 20 = $100.
N'ihi na ekpere Miss Grayson gara aga bụ $100 + $50 = $150 site n'ime.
Ego nke aga field gara aga bụ $7 x 20 = $140.
N'ile, ekpere Miss Grayson dị ọcha na $150 - $140 = $10.

Nke a bụ 10.``` 