Brine has a density of $1.2 g / c c$ . $40 c c$ of it are mixed with $30 c c$ of water. The density of solution is

2.11 g / c c

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1.11 g / c c

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12.2 g / c c

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20.4 g / c c

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Solution

The correct option is B $1.11 g / c c$
given, $ρ_{a} = 1.2 9 / c c V_{a} = 40 c c$
$ρ_{b} = 1 g / c c V_{b} = 30 c c$

$ρ_{m i x t u r e} = \frac{ρ_{a} V_{a} + ρ_{b} V_{b}}{V_{a} + V_{b}}$

So $ρ_{m i x t u r e} = \frac{1.2 \times 40 + 1 \times 30}{40 + 30} = \frac{78}{70}$

$ρ_{m i x t u r e} = 1.11 g / c c$

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