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# If weight of a cuboid of size $20\;cm \times 10\;cm \times 15\;cm$ is $50\;kg$ find the weight of another cuboid of same material with size $20\;cm \times 9\;cm \times 13\;cm$

$\begin{array}{1 1} 44\;kg \\ 37\;kg \\ 36\;kg \\ 39\;kg \end{array}$

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Solution :
$20 \times 10 \times 15 => 50 kg$
$20 \times 9 \times 13=> ?$
=> $x = \large\frac{20 \times 13 \times 50}{20 \times 10 \times 15}$
$x= 39\;kg$
Answer : 39 kg