If the average of 17,18,x,20,and 23 is 20,then the value of x would be?

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If the average of 17,18,x,20,and 23 is 20,then the value of x would be? ... If the average of 17,18,x,20,and 23 is 20,then the value of x would be?
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Positive: 26 %

15.The average value of A,B,C and C is 8 ... If 3a + 4a=14 and b+6b=20, then 7(a+b)=? ... If the average (arithmetic mean) of 20, 23, 14, x and y is 26 and ...
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26 %