DIRECTIONS for Questions: Answer the questions on the basis of the information given below.
In an examination, there are 100 questions divided into three groups A, B and C such that each group contains at least one question. Each question in group A carries 1 mark, each question in group B carries 2 marks and each question in group C carries 3 marks. It is known that the questions in group A together carry at least 60 % of the total marks.
If group C contains 8 questions and group B carries at least 20 % of the total marks, which of the following best describes the number of questions in group B?