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If the average person drinks eight 8oz - glasses of water per day, a person who drinks 12.8 oz of water after a morning exercise session has consumed what fraction of the daily average?

A \(\frac{\mathrm{1} }{\mathrm{5}}\)

\(\frac{\mathrm{12.8} }{\mathrm{64}}\) = 0.20.
0.20= \(\frac{\mathrm{20} }{\mathrm{100}}\), reduce \(\frac{\mathrm{20} }{\mathrm{100}}\) to \(\frac{\mathrm{1} }{\mathrm{5}}\).