Question

{4- [23+ (3.45 - 4.12) - 85] + (24 + 36:2)]}​

Answer 1

{4 - [23 + (3 · 45 - 4 · 12) - 85] + (24 + 36 : 2)}​

{4 - [23 + (135 - 48) - 85] + (24 + 18)}

{4 - [23 + 87 - 85] + 42}

{4 - [110 - 85] + 42}

{4 - 25 + 42}

-21 + 42

21