D : c = 33 : 22 where d is the number of dogs and c is the number of cats; and: d + c = 3030 33 c = 22 d / : 11 3 c = 2 d From the other equation: c = 3030 - d 3 * ( 3030 - d ) = 2 d 9090 - 3 d = 2 d 5 d = 9090 d = 9090 : 5 d = 1818 Answer: There are 1818 dogs in the shelter.
