Eight out of 21 instruments in the band are wood winds. if there are 63 instruments in the band, how many more are not wood winds than are wood winds

Im assuming it would be 60 or 60.375 (Work below)

Because usually when it says "out of" it means divide so i divided 8 from 21 and got 2.625 so then i took the 63 and subtracted 2.625 from that and got 60.375 so its either 60 or 60.375 again im not sure if im wrong im very sorry.