1.

A lotion of 7 ml contains 50% alcohol. How much quantity of water should be added to the lotion to make it 20% alcoholic lotion?1). 7 ml2). 10 ml3). 9 ml4). 10.5 ml

Answer»

Given, LOTION of 7 ml contains 50% alcohol.

∴ Amount of water = 50% of 7ml = 3.5ml

Amount of alcohol = 50% of 7ml = 3.5 ml

Let the water added be ‘a’ ml.

Now, in order to obtain 20% alcohol SOLUTION.

$(\frac{{3.5}}{{7 + a}} \times 100\%= 20\% \;)$

⇒ 5 × 3.5 = 7 + a

⇒ a = 10.5 ml



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