Any fraction will go into either or both of them.
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If 31 are boxcars then 91-31 = 60 are NOT boxcars. So 60/91 of the train are not boxcars.
91% = 91/100
.91=91/100
91/1
91/60 can not be reduced any further. You can however change it into a mixed numeral. 91/60 = 1 (+) 31/60