A quantity $y$ varies inversly with $x$ and if $y = 8$ , $x = 5$ , then for $x = 10$ , the value of $y =$

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Solution

The correct option is B 4
Given the quantity $y$ varies inversly as $x$ .
$\Rightarrow y \times x = K$
At $x = 5, y = 8 \Rightarrow y \times x = 8 \times 5 = 40$
$\Rightarrow K = 40$
Now for $x = 10$
$y \times 10 = 40 \Rightarrow y = 4$

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