Answer:
3/20
Step-by-step explanation:
Since 2/5 and 1/4 don't have the same denominator, we need to give them a common denominator.
2/5 * 4 = 8/20
1/4 * 5 = 5/20
8/20 - 5/20 = 3/20
3/20 is its simplest form
