3:0.75+（37-34.7）*6.6

Interpret as 3 ÷ 0.75 + (37 − 34.7) × 6.6.

• 3 ÷ 0.75 = 4
• 37 − 34.7 = 2.3
• 2.3 × 6.6 = 15.18
• 4 + 15.18 = 19.18

Answer: 19.18