यदि 18, 15x, 22, 28 और 31 का औसत 21 है, तो – McqOptions

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1.	यदि 18, 15x, 22, 28 और 31 का औसत 21 है, तो का मान क्या है? [ Delhi Police, 2001]
A.	16
B.	14
C.	12
D.	17
Answer» D. 17

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