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Explanation:
There are 45 carpenters total. 18 have kids, so 45-18 = 27 do not have kids.
The ratio of the total to the number who don't have kids is 45:27. We write the numbers in the exact order mentioned. Divide both parts of that ratio by the GCF 9 to get the final answer of 5:3
This says that for every 5 carpenters total, there are 3 who don't have kids.
