 
<translate> Maka ọbọgwụ ọcha ọ bụla enwere azụ 5 na enwere ọbọgwụ ọcha 3 maka ngụkọta nke 5 * 3 = azụ 15. Maka ọbọgwụ ojii ọ bụla enwere azụ iri na azụ asaa maka ngụkọta nke 10 * 7 = azụ 70. Maka ọbọgwụ ọ bụla nwere ọtụtụ agba, e nwere azụ iri na abụọ na e nwere ọbọgwụ isii nwere ọtụtụ agba maka ngụkọta nke azụ iri na abụọ * isii = iri asaa na abụọ. N'ozuzu, e nwere azụ 15 + 70 + 72 = 157 n'ọdọ mmiri ahụ. N'ihi ya, azịza ya bụ 157. <eng> For every white duck there are 5 fish and there are 3 white ducks for a total of 5 * 3 = 15 fish. For every black duck there are 10 fish and there are 7 black ducks for a total of 10 * 7 = 70 fish. For every multicolored duck there are 12 fish and there are 6 multicolored ducks for a total of 12 * 6 = 72 fish. All total there are 15 + 70 + 72 = 157 fish in the lake.
Thus, the answer is 157. 