 
<translate> Ọ bụrụ na ugbu a e nwere agụ iyi iri na ise n'ọdọ mmiri ahụ, n'ime afọ abụọ, a ga-enwe agụ iyi iri na ise * abụọ = iri atọ. N'ime afọ abụọ ọzọ, ọnụ ọgụgụ agụ iyi ndị dị n'ọdọ mmiri ahụ ga-amụba okpukpu abụọ ruo agụ iyi 2 * 30 = 60. N'ime afọ abụọ ọzọ, ọnụ ọgụgụ agụ iyi ndị dị n'ọdọ mmiri ahụ ga-amụba okpukpu abụọ ruo agụ iyi 2 * 60 = 120. Ọ bụrụ na mgbe afọ isii gachara, e nwere nnụnụ swans dị otu narị na iri abụọ n'ọdọ mmiri ahụ, n'ime afọ asatọ, ugboro abụọ, a ga-enwe nnụnụ swans dị narị abụọ na iri abụọ. N'ime afọ abụọ ọzọ, nke bụ afọ 10, a ga-enwe 2 * 240 = 480 swans n'ọdọ mmiri ahụ. Azịza ikpeazụ ya bụ: 480. <eng> If currently there are 15 swans in the pond, in two years' time there will be 15 * 2 = 30 swans. In another two years, the number of swans in the pond will double to 2 * 30 = 60 swans. In another two years, the number of swans in the pond will double to 2 * 60 = 120 swans. If after 6 years there are 120 swans in the pond, in eight years times there will be 2 * 120 = 240 swans. In another two years, which is 10 years, there will be 2 * 240 = 480 swans in the pond. The final answer: 480. 