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Renna pushed the button for the elevator to go up, but it would not move. The weight limit for the elevator is 450 kilograms, but the current group of passengers weighs a total of 750 kilograms. Renna wants to determine how many 70-kilogram passengers need to get off the elevator.

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The weight limit for the elevator is 450 kilograms, but the current group of passengers ... Renna pushedthe button for the elevator to go up, but it would not move. ... but the current group of passengers weighs a total of 750 kilograms. Renna wants to determine how many 70-kilogram passengers need toget off the elevator.
I could be wrong but 5. If only four 70 kilogram passengers get off then you will still be over the weight limit by 20 kilograms.

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