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4.Average

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Sachin Tendulkar has a certain average for $11$ innings. In the $12^{th}$ innings he scores $120$ runs and thereby increases his average by $5$ runs. His new average is

Solution

Let, Sachin's new average be $x$ runs.

$\therefore$ Total runs in $11$ innings $=11(x-5)$

Now, according to the questions,

$11(x-5)+120=12 x$

$\Rightarrow 12 x-11 x=65 \Leftrightarrow x=65$ runs

Std 13

Quantitative Aptitude

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