# Problem P. 3884. (April 2006)

**P. 3884.** There is a layer of oil on the surface of water and a wooden board is floating in it, such that half of its volume is submerged in the water and one-fourth of its volume is in the oil. What is the density of the board if the density of oil is 70% of the density of water?

(3 pont)

**Deadline expired on May 11, 2006.**

### Statistics:

155 students sent a solution. 3 points: 119 students. 2 points: 16 students. 1 point: 4 students. 0 point: 2 students. Unfair, not evaluated: 14 solutions.

Problems in Physics of KöMaL, April 2006