1.1. Some students were asked the following question.

“Which of the subjects Russian (R), French (F) and German (G) do you study?”

Of these students

4 study all three of Russian, French and German
10 study Russian and French
13 study French and German
6 study Russian and German
24 study German
11 study none of the three subjects
the number who study Russian only is twice the number who study French only.

Let $x$ be the number of students who study French only.

Show all this information on the Venn diagram, giving the number of students in each appropriate subset, in terms of $x$ where necessary.

1.2. Given that the number of students who were asked the question was 80, work out the number of these students that study Russian.