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Let $x$ , $y$ be the volumes; $m$ , $n$ be the masses of two metallic cubes $P$ and $Q$ respectively. Each side of $Q$ is two times that of $P$ and mass of $Q$ is two times that of $P$ . Let $u=\frac{m}{x}$ and $v=\frac{n}{y}$ . Which one of the following is correct? (2020)

$(a)$ $u=4v$
$(b)$ $u=2v$
$(c)$ $v=u$
$(d)$ $v=4u$

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CSAT 2021 | DDSQ Feb 3 | Civil Services | IAS | UPSC | State PSC | SSC | IBPS | NDA | CDS | Railways