Me solve for this:
75% of the people at a stadium are adults and the rest ate children. 30% of the children are girls. if there are 2100 people at the stadium, write an equation to demonstrate how many boys there are at the stadium and solve.

So you are saying that those that are not adults ate children. Right?
x = 2100 * .25 * .3
x is girl children
2100 is total people
.25 is the percent of total people that are children
.3 is the percent of children that are girls
The order of operation is irrelevant as it is all multiplication.

69 i think because is the only one square