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Four people want to cross a river in a rowing boat that can only carry 120kg. John weighs 85kg, Tom weighs 70kg, Anna weighs 60kg

Four people want to cross a river in a rowing boat that can only carry 120kg. John weighs 85kg, Tom weighs 70kg, Anna weighs 60kg and Irene weighs 50kg, and they have 25kg of supplies.

How many crossings (around trip counts as two) they will have to complete for all of them and their supplies to make it to the other side?

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