 
 <prompt> Ali nọ n'ime ihe ọjọọ nke seashells. O nọrọ na 180 seashells. O nọrọ ya na 40 seashells na ndi n'ime ya. O kwesịrị ya na 30 seashells na ndi n'ime ya. Ọ bụrụ na o gara iche ịzụrụ seashells, onweghị seashells ọzọ ya? <response>: ```N'ihi na ya tinyere 40 n'ụzọ ya, Ali nwere 180-40 = 140 seashells.
N'ihi na ya tinyere 30 n'ụzọ ya, ya nwere 140-30 = 110 seashells
O kwesịrị ịkpa nke ndị seashells, jiri 1/2*110 = 55 seashells
Ya nwere 110-55 = 55 seashells

Ntụgharị a: 55.``` 