Question

SOLVE THIS QUESTION ​

Answer 1

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Answer 2

Volume of dissolved substance Total volume of liquid×100=percentage

v400×100=15v400×100=15

. So, the equation formed will be-

60+x400+x×100=3260+x400+x×100=32

⇒60+x=0.32(400+x)⇒60+x=0.32(400+x)

⇒60+x=128+0.32x⇒60+x=128+0.32x

⇒0.68x=68⇒0.68x=68

⇒x=100mL⇒x=100mL

Therefore, 100 mL of alcohol should be added to make the strength 32%. This is the required answer.