 
 <translate> The question Bill is trying to control the pests in his garden. Each spider he introduces eats 7 bugs, and each time he sprays the garden he reduces the total bug population to 80% of what it was previously. If the garden has 400 bugs to start, and Bill sprays once and introduces 12 spiders, how many bugs are left? <ibo> Ajụjụ bụ Bill na-agbalị ịchịkwa pests n'ubi ya. Onye ọ bụla o webatara na-eri ụmụ ahụhụ asaa, mgbe ọ bụla o fesara ubi ahụ mmiri, ọ na-ebelata ọnụ ọgụgụ ụmụ ahụhụ ahụ ruo pasent 80 nke ihe ha bụbu. Ọ bụrụ na e nwere ụmụ ahụhụ 400 n'ubi ahụ ná mmalite, Bill agbasakwa otu ugboro ma webata ududo iri na abụọ, ụmụ ahụhụ ole ka fọdụrụ? 