Yes, because there is a common denominator. This would be 3. If you divide 3 on both the numerator and denominator, the simplified fraction would be 2/5.

DarlineHamernik

Yes, 6/15 can be simplified, because it has a common denominator, GCF. Which is 3. Both numbers are divisible by 3 so 6/15 can be simplified further.
6/15
6 ÷ 3 = 2
15 ÷ 3 = 5
2/5
6/15 in simplest from is 2/5.