The question, as it appears, makes no sense.
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The ratio of the constituents of a mixture cannot be determined.
if the unit digit ie the '3' in 53 is less than 5, round down - if the unit digit is 5 -9 you round up.. Examples... 41 - round down to 40 67 - round up to 70 59 - round up to 60 33 - round down to 30 56 - round up to 60 75 - round up to 80
Slump test
You would round it UP - to 70
lets say you have the number 0.254 to round it to the nearest fourth you round it to 0.25 4 and below round down 5 and up round up