algebra

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How many liters of a 20% solution of acid should be added to 10 liters of a 30% solution of acid to obtain a 25% solution?

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  • algebra -

    looks very similar to the question just posted by Lily.

    let the amount of 30% solution we want to add be x l
    now let's reason it through....

    the volume of acid we have before adding is .3(10) l or 3 l

    we are adding x l of a 20% solution so we are adding .2x l

    but the final solution containing 10+x l is to contain 25% acid or .25(10+x) l of acid

    so isn't our equation...
    3 + .2x = .25(10+x) ?

    solve for x and tell me what you got.

  • algebra -

    How many liters of a 8% solution of acid should be added to 20 liters of a 60% solution of acid to obtain a 40% solution?

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