An object of weight $W$ is suspended from a newton meter. When the object is completely immersed in water, the newton meter reads P. When the object is completely immersed in oil, the newton meter reads $Q$.
What is the ratio $\frac{\text{density of oil}}{\text{density of water}}$?

1 )
$\frac{W - P}{Q - P}$
2 )
$\frac{Q - P}{W - P}$
3 )
$\frac{W - P}{W - Q}$
$\frac{W - Q}{W - P}$
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