What is 3 minus three fifths?

To calculate 3 minus three-fifths, first convert 3 into a fraction with a denominator of 5. This gives us 3 as 15/5. Then, subtract three-fifths (3/5) from 15/5:

15/5 - 3/5 = 12/5.

Thus, 3 minus three-fifths equals 12/5, or 2.4 in decimal form.