11.3 A bag contains only two colours of tennis balls, red and green, in the ratio Two balls are picked at random, one after the other, without replacement. Calculate the number of balls in the bag given that the probability of picking first a red ball and second a green ball is equal to \( \frac{1}{5} \).

A) \( 9 \sqrt{10}-2 \sqrt{3}+5 \sqrt{10}-4 \sqrt{3}= \) B) \( 10 \sqrt[3]{2}+5 \sqrt{2}-3 \sqrt[3]{2}+7 \sqrt{2} \)

6. Sea \( g(x)=2 p x^{5}-3 \) una función en los reales. Si \( g\left(\frac{3}{2}\right)=\frac{3}{8} \), entonces el valor numérico de \( p \) es A) \( \frac{1}{72} \) B) \( \frac{2}{81} \) C) \( \frac{4}{81} \) D) \( \frac{2}{9} \) E) \( \frac{8}{9} \)

A) \( \sqrt{20} \cdot \sqrt{15}, \sqrt{3}= \) B) \( 2 \sqrt{55}: 3 \sqrt{11}= \)

(c) Solve for \( q \) for the equation \( \frac{12}{8}-\frac{5 q+12}{12}=\frac{0.5(12-4 q)}{4}+\frac{12}{6} \quad \) (3 marks)

c) \( x-8=27 \)