 
<translate> Ka c bụrụ ọnụ ọgụgụ nwamba na ka d bụrụ ọnụ ọgụgụ nkịta. Anyị maara na c = 20 + d nakwa na ngụkọta nke ụmụ anụmanụ bụ c + d = 60. Ịgbanwe c na-enye 20 + d + d = ụmụ anụmanụ 60. Na ijikọta okwu ndị yiri ibe ha ma wepụ 20 site n'akụkụ abụọ, anyị na-enweta 2d = 40. Nkewa abụọ abụọ site na 2, anyị na-enweta d = 40 / 2 = 20. N'ihi ya, ụlọ nche ahụ nwetara nwamba 20 + 20 = 40. Azịza ya bụ: 40. <eng> Let c be the number of cats and let d be the number of dogs. We know that c = 20 + d and that the total number of animals is c + d = 60. Replacing c gives 20 + d + d = 60 animals. Combining like terms and subtracting 20 from both sides, we get 2d = 40. Dividing both sides by 2, we get d = 40 / 2 = 20. The shelter therefore received 20 + 20 = 40 cats. The answer: 40. 