(91,3+2,16:0,8)-90•0,6

Interpret the expression as (91,3 + 2,16 ÷ 0,8) − 90 × 0,6.

• 2,16 ÷ 0,8 = 2,7
• 91,3 + 2,7 = 94,0
• 90 × 0,6 = 54,0
• 94,0 − 54,0 = 40,0

Answer: 40,0 (i.e., 40).