Question

0.2 If the mean of first 'n' natural numbers is5x/9 then x=?​

Answer 1

Given that the mean of first 'n' natural numbers = 5x / 9

We know that

mean of n natural numbers = ( n + 1 / 2 )

( x + 1 ) / 2 = 5x / 9

9 ( x + 1 ) = 2 ( 5 x )

9x + 9 = 10x

9 = 10x - 9x

9 = x

:. The value of x = 9

Answer 2

The correct answer is "x=9".

Step-by-step explanation:

$Given \ mean=\frac{5x}{9}\\\\ As \ we \ know,\\\\Mean \ of \ "n" \ natural \ number=\frac{n+1}{2} \\\\On \ putting \ the \ values,we \ get\\\\\frac{x+1}{2} =\frac{5x}{9}\\\\ On \ applying \ cross \ multiplication,we \ get\\\\9(x+1)=5x\times 2\\9x+9=10x\\On \ subtracting \ "9x" \ from \ both \ sides,we \ get\\9x+9-9x=10x-9x\\x=9$

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