The highest common factor 16 and 20 is 4.So divide both the numerator and the denominator of the ratio, 16/20 by this HCF.
The answer, therefore is 4/5.
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that is the simplest form
5 20ths in its simplest form is 1 4th, or 1 over 4, or 1/4.
9/20 is in its simplest form.
Twenty twentieths in its simplest form is... 1
2 5ths