20,9:5,5;1 1/21:2/7;2 4/17:10/17

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To find the average of these fractions, you need to add them together and then divide by the total number of fractions.

(20/9 + 5/5 + 1 + 1/21 + 2/7 + 2/17 + 10/17) / 7

Convert all fractions to have a common denominator of 189:

(380/189 + 189/189 + 189/189 + 9/189 + 54/189 + 22/189 + 90/189) / 7

Adding the fractions:

(933/189) / 7

Dividing by 7:

133/27

Therefore, the average of these fractions is 133/27.