 
 <translate> The number of trees is three times more than the number of rocks, meaning there are 3 * 40 = 120 more trees than rocks in the courtyard. The total number of trees in the yard is 120 + 40 = 160. Combined, there are 160 + 40 = 200 trees and stones in the courtyard. Since the number of birds is twice the combined number of trees and stones in the courtyard, there are 2 * 200 = 400 birds on the trees. So the answer is 400. <ibo> Ọnụ ọgụgụ osisi dị okpukpu atọ karịa ọnụ ọgụgụ nkume, nke pụtara na e nwere osisi 3 * 40 = 120 karịa nkume n'ogige ahụ. Ọnụ ọgụgụ osisi nile dị n'ogige ahụ bụ 120 + 40 = 160. E jikọta ha, e nwere osisi na nkume 160 + 40 = 200 n'ogige ahụ. Ebe ọ bụ na ọnụ ọgụgụ nnụnụ dị n'ogige ahụ ji okpukpu abụọ karịa ọnụ ọgụgụ osisi na nkume ndị dị n'ogige ahụ, nnụnụ ndị dị n'osisi ndị ahụ dị 2 * 200 = 400. Ya mere azịza ya bụ 400. 