exam Maths Puzzle Numerical Ability

3x-5=5x+27

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exam Other Question

If there are 400 cubic centimeters of a chemical in 1 liter of solution, how many cubic centimeters of water must be added to dilute it to a 25% solution? (hint 1000 cc = 1 liter) Is the following binomial a difference of squares?

9a^2-8b^2