 
 <prompt> A gịnị ka ụlọ ịgba 900-nkewa na-akpọ n'ime ụkwụ. Site na 6 nkewa, ụkwụ nwere ike ịkpa. Ọ bụghị ụkwụ nwere ike ịkpa n'ime ụkwụ nke na-eme 42-nkewa. Kọwa ụkwụ nwere ike ịkpa ga-akpọ n'ime ụkwụ nke na-eme n'obi nke ụgbọala? <response>: Nkeji, e nwere 900 - 42 = 858 ojiji n'ime n'ala.
E nwere ike ịgba ọkụ 6 nkeji, n'ihi na ụlọ ahịa choro 858 / 6 = 143 ọkụ.
Ọkụ na-eme ka ọkụ gaa n'ime ụzọ nkeji, nke a ga-eme 143 * 2 = 286 ọkụ ọfensị n'ala ala.

Ọ bụghị ihe ọ bụla ga-eji 286. 