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The two square pyramids are similar. find the total volume of both pyramids if the ratio of their surface areas is 9/16

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

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?