If you are sitting in a room with ten people and 39% of them leave how many people would be left?

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?