Seven cats and 3 dogs weigh as much as 4 monkeys. One monkey weighs as much as 1 cat and 1 dog. How many cats weigh as much as 1 dog?

2 answers

7c+3d = 4m
1m = 1c+1d
So,
4m = 4c+4d

7c+3d = 4c+4d
3c = d
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