exam Maths Puzzle Numerical Ability

A chemist needs to mix 20 liters of 40% salt solution with some 70% solution to get a mixture that is 50% salt. How many liters of 70% solution should be used?

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exam Other Question

Find the imaginary solutions: x^2 + 20x + 101 = 0 {{{ 2(4i+3)^2 }}}