SOLUTION: how much kg of water to be added to 38 kg of 60 % hydrofluoric acid to make it 40 % of hydrofluoric acid.?

Question 1058545: how much kg of water to be added to 38 kg of 60 % hydrofluoric acid to make it 40 % of hydrofluoric acid.?
Answer by ikleyn(52815) (Show Source): You can put this solution on YOUR website!
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how much kg of water to be added to 38 kg of 60 % hydrofluoric acid to make it 40 % of hydrofluoric acid.?
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Your equation is

0.6*38 = 0.4(38+W),

where W is the unknown volume of water to be added.

Simplify and solve for W.

By the way, it is better to formulate this problem in the volume terms (liters) than in the mass terms (kilograms).

There is entire bunch of lessons covering various types of mixture problems
    - Mixture problems
    - More Mixture problems
    - Solving typical word problems on mixtures for solutions
    - Word problems on mixtures for antifreeze solutions
    - Word problems on mixtures for alloys
    - Typical word problems on mixtures from the archive
in this site.

Read them and become an expert in solution the mixture word problems.

Also, you have this free of charge online textbook in ALGEBRA-I in this site
    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.

The referred lessons are the part of this textbook in the section "Word problems" under the topic "Mixture problems".

The textbook contains many other solved word problems, as well as many other interesting and useful things.

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