To answer this, you first have to find 3/8 of 4200 by multiplying those two numbers.

First, multiply the numerators.
4200x3=12600
Next, multiply the denominators.
1x8=8
You end up with
.
This fraction can be simplified to 1575.
All that's left is to subtract that number from 4200.
4200-1575=2625
The final answer is 2625 adults in Lakeview have children.