 
 <translate> Mrs. Fredrickson has 80 x 1 / 4 = 20 roosters. So he has 80 - 20 = 60 hens. Only 60 x 3 / 4 = 45 of the hens lay eggs. Thus, 60 - 45 = 15 hens do not lay eggs. Therefore, Mr. Fredrickson has a total of 15 hens + 20 roosters = 35 chickens that do not lay eggs. So, the answer is 35. <ibo> Nwunye Fredrickson nwere oke ọkpa iri asatọ na otu na ọkara, ya bụ oke ọkpa iri abụọ. Ya mere o nwere 80 - 20 = 60 ọkụkọ. Ọ bụ nanị nne ọkụkọ 60 x 3 / 4 = 45 na-ata àkwá. N'ihi ya, ọkụkọ 60 - 45 = ọkụkọ 15 adịghị akpa àkwá. Ya mere, Maazị Fredrickson nwere ngụkọta nke ọkụkọ 15 + ọkpa 20 = ọkụkọ 35 ndị na-adịghị akpa àkwá. Ya mere, azịza ya bụ 35. 