document.write( "Question 1115407: how much quantity of water to be added in 100 kg HF of 70% to make it to HF 60%?\r
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Algebra.Com's Answer #730295 by Alan3354(69443)\"\" \"About 
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how much quantity of water to be added in 100 kg HF of 70% to make it to HF 60%?
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\n" ); document.write( "Add W kg.
\n" ); document.write( "Then,
\n" ); document.write( "100*70 + W*0 = (100+W)*60
\n" ); document.write( "Solve for W
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