One-fifth and four-fifths makes a whole.
20c = 1 whole. 80c = 4 whole. 16c = 4/5 whole.
One fifth of a gallon. The liquor industry started this when instead of raising the price on a quart of whiskey they reduced the bottle size to one fifth. It is four/fifths from being a whole if your a pessimist, If your an optimist you only need four more fiths to make a whole.
5
80%. Each fifth is 20%. Divide 100% (everything), by 5 (5=one fifth) of the whole.
Four of them.
Four.
18
four, as usual
There are four fifth Fridays in 2012, they fall in the months of:MarchJuneAugustNovember
80 cents
Four.