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25 August, 21:42

How many litres of pure antifreeze should be added to 5 litres of 30% antifreeze solution to create a 65% antifreeze solution?

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  1. 25 August, 23:05
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    0.65% of new amount=old amount of 30% plus amount of new

    0.65 (x+5) = 5 (0.3) + x

    solve

    distribute

    0.65x+3.25=1.5+x

    minus 1.5 from both sides

    0.65x+1.75=x

    minus 0.65x both sides

    1.75=0.35x

    divide both sides by 0.35

    5=x

    5 liters of pure should be added
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