book 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

What is the interior degrees of a 20-gon? An investment of $1500 paid interest of $45 during a certain period. How much interest would an investment of $2000 invested at the same rate for the same length of time pay?

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