one twentieth
1 / 5 x 1 / 4 = (1 x 1) / (5 x 4) = 1 /20
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one fifth of one half of one quarter of one tenth of 400 = 11/5 * 1/2 * 1//4 * 1/10 * 400 = 400/400 = 1
one fifteenth
1/5 + 1/4 = 4/20 + 5/20 = 9/20 or 0.45
'1/4' NB 1/2 = one half 1/3 = one third 1/5 = one fifth et seq.,
One-fifth in decimal form is .20, because 5 times .20 is one whole. Hope this helps!