# NIELIT 2019 Feb Scientist D - Section D: 21

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How many litres of a $3\%$ hydrogen peroxide solution should be mixed with $6$ liters of a $30\%$ hydrogen peroxide solution so as to get a mixture of $12\%$ solution ?

1. $3$ litres
2. $6$ liters
3. $9$ litres
4. $12$ litres

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Option (C)

Let x litres of hydrogen peroxide solution should be added, then

0.03x + (0.3)(6) = 0.12(x + 6)

x = 9.25 $\approx$ 9 litres.

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