A boy spent ¼ of his time reading, 1/5 washing , 1/3 sleeping and the remaining 13 minutes
playing games. What is the total time spent?
T/4 + T/5 + T/3 + 13 = T
(15/60 + 12/60 + 20/60)T + 13 = T
47 T/60 + 13 = T
47 T + 780 = 60 T
13 T = 780
T = 60