1) Paul can mow the lawn in 40 minutes and John can mow the lawn in 60 minutes. How long will it take for them to mow the lawn together? a) 22 minutes b) 23 minutes c) 24 minutes d) 25 minutes 2) A tank can be filled by pipe A in 3 hours and by pipe B in 5 hours. When the tank is full, it can be drained by pipe C in 4 hours. If the tank is initially empty and all three pipes are open, how many hours will it take to fill up the tank? a) 3 and 9/17 hours  b) 1 and 4/15 hours c) 4 and 1/16 hours d) 2 and 1/14 hours 3) Phillip is Thomas' father. Phillip is 35 years old. Three years ago, Phillip was four times as old as his son was then. How old is Thomas now? a) 8 years old b) 11 years old c) 10 years old d) 13 years old 4) Lisa is 16 years younger than Jennie. If the sum of their ages is 30, how old is Lisa? a) 5 years old b) 14 years old c) 10 years old d) 7 years old

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