TMUA Official 2016 Paper 1 · Question 6

P, Q, and R are each mixtures of red and white paint.

The percentage by volume of red paint in P is 30%.

The percentage by volume of red paint in Q is 20%.

The mixtures P, Q, and R are combined in the proportion $12:5:3$ respectively.

If the resulting mixture contains 25% by volume of red paint, what percentage by volume of mixture R is red paint?

A25%

B23%

13\dfrac{1}{3}\%

19\dfrac{1}{2}\%

9\dfrac{3}{4}\%

FIt is impossible to achieve this result.

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