1/2 - 1/4 = ?

can anyone help me with this :) I forgot how to do it

Type the correct answer in each box. use numerals instead of words. if necessary, use / for the fraction bar. consider the given table.

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?

42. if 20 men can eat 200 kg of wheat in 40 days, then 10 men can eat 300 kg of wheat in how many days? a) 120 days b) 60 days c) 80 days d) none of these