21.5 is 43/2 as a fraction.
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If all 3 digits are repeating then as a fraction it is 215/999
For an ordinary year, 215 days/1 year = 215 days/365 days = 0.589 For a Leap ordinary year, 215 days/1 year = 215 days/366 days = 0.587
215/12
215 is divisble by 1, 5, 43 and 215.
(150 + 280) ÷ 2 = 215