Answer:
youd start and see that you can divide 12/3 this gives you 4 you then divide 4/4 and find 1 so he can do 3 lawns in 1 hour thus you just mutiplltiply each side by 7 so it'd be 21 and 7
Explanation:
should look like this
3 1
12 4
21 7
3 - 1
12 - 4
21 - 7
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