40/50 = 80%
A value like 40/50, or 80%, might describe a test score, a phone battery level, or how much of a goal someone has completed. It means four out of every five parts are there.
To picture it quickly, imagine a row of five equal boxes with four shaded in. You can also think of it as a little more than three-quarters, since three-quarters is 75%.
One common mix-up is treating 80% as 80 out of 50, rather than as a share of the whole. The denominator matters: here, the 50 is the total number of parts, and 40 of them are being counted.
