what is the density of a block of wood that floats in water with 0.1 of its volume above water?
Please refer to the link. You will find the answer in the last part:
https://www.meritnation.com/ask-answer/question/q-a-boat-floats-on-water-with-3-4-th-of-its-volume-i/gravitation/1840805
https://www.meritnation.com/ask-answer/question/q-a-boat-floats-on-water-with-3-4-th-of-its-volume-i/gravitation/1840805