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Some children have built a flat raft made of wooden planks of density 5.5 x 10kg/m. The raft is 2.0 m long, 1.7 m wide

Some children have built a flat raft made of wooden planks of density 5.5 x 10kg/m. The raft is 2.0 m long, 1.7 m wide and 4.0 cm thick. In order for the children not to get wet on a freshwater lake (density 1.00 x 10kg/m), what is the maximum mass that the raft can carry?

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