exam Maths Puzzle Numerical Ability

Suppose we wish to mix some 32% salt solution with some 58% salt solution to produce ten liters of 46.3% salt solution. How many liters of each of the starting solutions needs to be used?

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please walk me through the process for solving this

(x2 + 5x +4 / x3y2)(x2y3/2 +2x + 1)

Thank you. The ratio of the number of red beads to blue beads in a box was 3:1. 3 more red and 4 more beads were added and the ratio became 2:1. How many red beads were there at first?