Mean = (9 + 10 + 2 + 5 + 5)/5 = 31/5 = 6.2
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if you mean 5 over 10 + 2 over 5, then your answer is 9 over 10.
9/10 - 2/5 = 9/10 * 4/10 = 5/10 = 1/2 or 0.5
9/10 - 1/2 = 9/10 - 5/10 = 4/10 = 2/5
9/10 − 2/5 = 1/2
if you mean 9/10 + 3/5 then multiply 3/5's numerator and denominator to get 6/10, which you can add to 9/10 to get 15/10, or 3/2. 1 1/2 if you need mixed numbers.