Question

How much pure alcohol should be added to 600ml ,15% alcohol solution to make it contain 25% alcohol?​

Answer 1

Answer:

80 ml

Step-by-step explanation:

Let +x+ = ml of pure alcohol to be added

+.15%2A600+=+90+ ml of alcohol in 15% solution

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+%28+x+%2B+90+%29+%2F+%28+x+%2B+600+%29+=+.25+

+x+%2B+90+=+.25%2A%28+x+%2B+600+%29+

+x+%2B+90+=+.25x+%2B+150+

+.75x+=+60+

+x+=+80+