Remove shoes

Boiler Puzzle    Valves
48/2= 24	   1
24-4= 20	   3
20*5= 100	   4
100+2= 102	   2

Elevator
Y 25
B 33
R 1

First Entry	Second Entry
    P		     Qn4
   Qn 		     QB3
   QB 		     Qn2
    Q 		     Qn1