Q11
You don't have the right answer available. If 10 people shake hands, then there are 10+9+8+7+6+5+4+3+2+1 separate handshakes, which adds up to 55. Some of these are also odd questions that don't necessarily belong on an IQ test, but the presentation and most of the questions are well done. I also appreciated having math heavy questions separated by critical thinking questions. Makes for a better quiz.