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4.Average

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The average of three numbers is $154 .$ The first number is twice the second and the second number is twice the third. The first number is

A

$264$

B

$132$

C

$88$

D

$66$

Solution

Let the third number be $x$.

$\Rightarrow$ Second number $=2 x$ and First number $=4 x$

Now, according to the question,

$4 x+2 x+x=154 \times 3$

$\Rightarrow \quad 7 x=462$

$\therefore \quad x=\frac{492}{7}=66$

$\therefore$ First number $=4 x=4 \times 66=264$

Std 13

Quantitative Aptitude

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