What is a 15 out of 18?

When expressed as a fraction, 15 out of 18 can be simplified to 5 out of 6. This means that if you have a total of 18 items or parts, 15 of them are being considered or counted. In terms of percentage, 15 out of 18 is equal to 83.33%. This indicates that 15 out of 18 is approximately 83.33% of the total.