Question

A puppet show crew uses a timer that includes both negative and positive minutes for before and during the play. If it takes the crew 40 minutes to assemble the box stage, 13 minutes to organize the sock puppets, and 10 minutes to greet the children, what time should the timer read when they begin? –63 minutes –17 minutes 0 minutes 53 minutes

Answer 1

 it takes 
63+17+0+53 minutes
116+17 minutes
133minutes
hence the timer must show 133 minutes