21.5 as a mixed number = 21 1/2
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215 is an odd number.
90% of 215 = 215*90/100 = 193.5
The mixed number is: 3 87/100
It is: 6.17 = 6 and 17/100 as a mixed number
A mixed number is a rational number. Mixed numbers are not a rational number but many of them.