Peter R. answered 06/20/22
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Experienced Instructor in Prealgebra, Algebra I and II, SAT/ACT Math.
Here's another way.
6 + 7 + 3 = 16, so women are 7/16th of the total. 7/16th of x = 42000, where x is the total.
7x/16 = 42000 -> 7x = 672000 -> x = 96000 total
Now that you know that, children are 3/16th of 96000 = 18000 children.