Question

(1845:15+(873-689)'12):21-109
((58-506:23)'(101'27-2685)+1748):163

Answer 1

((58-506:23)'(101'27-2685)+1748):163 = ((36)*(42)+1748)=3260:163=20
(1845:15+(873-689)*12):21-109 = (123+2208):21-109 = 111-109 =2