Respuesta :

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Answer:

375 ml of 95%  is what we need to obtain the desired solution

Explanation:

Solution

Now

450 ml of 40% alcohol mixture +95% mix of x = 65% (450 +x)

Thus

0.40 * 450 +0.95 x = 0.65 (450 + x)

180 + 0.95 x =0.65 (450 +x)

180 +0.95 x = 292.5 + 0.65 x

So,

0.95 x - 0.65 x = 292.5 - 180

= 0.3 x = 112.5

x =112.5/0.3

x= 375 ml

Therefore, we will need 375 ml of 95% solution