Posted by Saraphina on Wednesday, February 13, 2013 at 7:30am.
let the number of cats be 12x
let the number of dogs be 9x
12x - 9x = 4
3x=4
x = 4/3
number of cats = 12x = 12(4/3) = 16
number of dogs = 9(4/3) = 12
for a total of 28 cats and dogs.
check:
16:12 = 4:3 or the given 12:9
cats - dogs = 16-12 = 4 , thus 4 more cats than dogs
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