A wooden raft has a mass of 50 kg. When empty it floats in water (density with 69% of its volume submerged. What mass of sand can be put on the raft without it sinking?

Question

A wooden raft has a mass of 50 kg. When empty it floats in water (density  with 69% of its volume submerged. What mass of sand can be put on the raft without it sinking?

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The Answer of A wooden raft has a mass of 50 kg. When empty it floats in water (density  with 69% of its volume submerged. What mass of sand can be put on the raft without it sinking?

A Wooden Raft Has a Mass of 50 Kg