1/5 + 1/4 = 4/20 + 5/20 = 9/20 or 0.45
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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
'1/4' NB 1/2 = one half 1/3 = one third 1/5 = one fifth et seq.,
Well, darling, one and one fifth minus one quarter is one and one fifteenth. Just remember to keep your fractions straight and you'll be golden. Math may not be everyone's cup of tea, but hey, it's not rocket science...unless you're doing rocket science.
one twentieth 1 / 5 x 1 / 4 = (1 x 1) / (5 x 4) = 1 /20
one fifteenth