3/15-1/15

2/15

Reason:

• If you subtract with the same denominator: (3/15) − (1/15) = (3−1)/15 = 2/15.
• This is already in simplest form (gcd(2,15)=1).
• Quick check: 3/15 = 1/5, so 1/5 − 1/15 = 3/15 − 1/15 = 2/15.
• Decimal: ≈ 0.1333.