What would 4 divided by 2 3/4 be?

My math teacher told my class to "steal" a 6th grade fraction word problem from the internet, word problems? : -p requirements: only a 1 step word problem. needs to be complex.

Which expression demonstrates the use of the commutative property of addition in the first step of simplifying the expression (-1+i)+(21+5i)+0

Cody was 165cm tall on the first day of school this year, which was 10% taller than he was on the first day of school last year.