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Sticky Note
If ¼ is the average (arithmetic mean) of ⅕ and what number?
  1. ⅖
  2. ⅗
  3. ⅓
  4. ⅖
Explanation

Let the unknown number = x
(1/5 + x)/2 = 1/4 → Multiply both sides by 2:
1/5 + x = 1/2 → x = 1/2 - 1/5 = (5−2)/10 = 3/10 = ⅖

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