Three dance lessons lasted for 2 hours and 30 minutes altogether. Each dance lesson took an equal amount of time. How long was each dance lesson?
All 3 dance lessons took 120 + 30 = 150 min. Each dance lesson took equal time, so by dividing 150 by 3, we get time consumed by each dance lesson. So each dance lesson took, 150÷3 = 50 min.