Question

in what proportion should 10% and 7% alcohol be mixed to get 5% alcohol
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Answer 1

The ratio of alcohol and water in three mixtures of alcohol and water is 3:2, 4:1, and 7:3. If equal quantities of the mixture are drawn and mixed, the concentration of alcohol in the resulting mixture will be?

A)65%

B)70%

C)75%

D)80%

how can the following problem be solved using the scale/ratio formula method?

The ratios are given such that the sum of alcohol and water can be brought up to 10 for each mixture. (Since equal quantities are to be added)

For 3:2 lets take 6 parts alcohol and 4 parts water

For 4:1 lets take 8 parts alcohol and 2 parts water

For last since the sum is already 10, 7 parts alcohol and 3 parts water.

Mixing these three will give 6+8+7 =21 units alcohol and 4+2+3=9 units water

or, 21 units alcohol in 30 units of mixture

21/30 *100 = 70%

Answer 2

Answer:

2:5 is the ratio

Explanation:

We can solve this question with the help of the mixture and alligation chapter concept.

as we know that , 10 % and 7% alcohol be mixed to get 5% alcohol so, we use this method,

10%              7%

         5%

(7-5)%  :    ( 10-5)%

2           :         5

this is the required proportion.

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