(1/3-1/6):(-2)-2 1/2:(-3)

Interpret colon “:” as division.

Compute:

• (1/3 − 1/6) = 1/6
• (1/6) ÷ (−2) = −1/12
• 2 1/2 = 5/2
• (5/2) ÷ (−3) = −5/6

Then: (−1/12) − (−5/6) = −1/12 + 5/6 = −1/12 + 10/12 = 9/12 = 3/4

Answer: 3/4 (or 0.75).