 <translate> Mgbe Derek dị afọ isii, o nwere ụgbọala iri atọ n'ime ụgbọala iri atọ ndị o nwere n'oge ahụ. Afọ iri ka e mesịrị, mgbe Derek zụtasịrị ụgbọala 210 ọzọ, o nwere ụgbọala 210 + 30 = 240. Ebe ọ bụ na ọnụ ọgụgụ ụgbọala ji okpukpu abụọ karịa nke nkịta, Derek nwere nkịta 240 / 2 = 120 ugbu a. Azịza ya bụ otu narị na iri abụọ. <hau> A shekara shida, tare da karnuka sau uku fiye da motoci, Derek yana da 90 / 3 = motoci 30. Shekaru goma bayan haka, bayan ya sayi ƙarin motoci 210, Derek yana da motoci 210 + 30 = 240. Tun da yawan motoci sau biyu ne fiye da adadin karnuka, Derek a halin yanzu yana da karnuka 240 / 2 = 120. Amsar ƙarshe: 120. 