exam 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. Can you please show the formula for mixture problems. thank you.

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exam Other Question

I HAVE A QUESTION ON SOLVING BY FACTORING((( X^2+6X+8=0 ))) I need help solving this problem.

The relation is x=0
The Domain/Range is 3<y<5, it should read less than or equal to.