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On Saturday Lily was a referee at 3 soccer games. She arrived at the soccer field 15 minutes before the first game. Each game lasted for 1 [tex] \frac{1}{2} [/tex] hours. There were 5 minutes between each game. Lily left 10 minutes after the last game. How long, in minutes, was Lily at the soccer field?

Sagot :

Lily stayed in 305 minutes or 5 hours and 5 minutes. Solution? Just start with 15, then add it with 130. Add 5, then repeat the procedure of adding 130 and 5 two times. Finally, add 10.