Mary just held tryouts for the high school band. 80% of the 20 flutes got in, half the 30 clarinets got in, 1/3 of the 60 trumpets got in, and 1/10th of the 20 pianists got in. How many people are in the band total?
First find the total number of flutes who were accepted: 20 flutes * .8 = <<20*.8=16>>16 flutes
Then find the total number of clarinets who were accepted: 30 clarinets * .5 = <<30*.5=15>>15 clarinets
Then find the total number of trumpets who were accepted: 60 trumpets * 1/3 = <<60*1/3=20>>20 trumpets
Then find the total number of pianists who were accepted: 20 pianists * 1/10 = <<20*1/10=2>>2 pianists
Then add the number of each kind of instrument to find the total number of people in the band: 16 flutes + 15 clarinets + 20 trumpets + 2 pianists = <<16+15+20+2=53>>53 people
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