A plastic sphere floats in water with 50. 0% of its volume submerged. This same sphere floats in glycerin with 40. 0% of its volume submerged. Determine the densities of (a) the glycerin and (b) the sphere.

Arecent survey shows that the probability of a college student drinking alcohol is 0.6. further, given that the student is over 21 years old, the probability of drinking alcohol is 0.8. it is also known that 30% of the college students are over 21 years old. the probability of drinking or being over 21 years old is