1.

The average of 23, 34, x, 21, 19 and 18 is 21. What is the value of x?1). 92). 103). 114). 12

Answer»

The average of 23, 34, X, 21, 19 and 18 = 21

$(\RIGHTARROW \;\frac{{23 + 34 + x + 21 + 19 + 18}}{6} = 21)$

⇒ 23 + 34 + x +21 + 19 + 18 = 21 × 6

⇒115 + x = 126

⇒ x = 11


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