3/15 = 20%
A value of 20% might show up as a discount on a shirt, a tip, or the share of students in a class who ride the bus. It’s a useful way to describe a part of a group or a change in price.
A quick way to picture it is as about one-fifth of the whole. If there are 15 things, imagine setting aside 3 of them.
One common mix-up is thinking that 20% always means 20 items. It describes a share, so the actual number depends on how many items there are altogether.
