The capacity of an elevator is either 25 children or 19 adults. if 11 children are currently in the elevator, how many adults can still get in?

Hello,

If 25 children can get into the elevator, then each child takes up 1/25 of the elevator.
If 19 adults can get into the elevator, then each adult takes up 1/19 of the elevator.

If 11 children are in the elevator, then (11)(1/25) = 11/25 of the elevator is filled up.

That means (1) - (11/25) = (14/25) of the elevator is still empty.

If each adult takes up 1/19 of the elevator, and there is 14/25 of the elevator still empty, we can simply divide 14/25 by 1/19 to get the number of adults that can still get in.

Doing this, we get :
(14/25) / (1/19) = 10.64

10.64 adults can get in, but we cannot have 0.64 of an adult.
Therefore, 10 adults can still get in.

Hope this helps!