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Maths Puzzle
Numerical Ability
How much pure acid should be mixed with 2 gallons of a 40% acid solution in order to get a 70% acid solution?
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book Other Question
log (x+21) + log x = 2
2(x+3.1)=9.8
PLEASE HELP ME AS SOON AS POSSIBLE I NEED MY HOMEWORK DONE BY 3:15!!!!!!! sorry to rush you!