1. At the end of a political banquet 10 people shake hands with each other. How many handshakes will there be in total?
2. The day before the day before yesterday is three days after Saturday. What day is it today?
3. 10 is to 6 as 3 is to:
4. Library is to book as book is to:
5. 165135 is to peace as 1215225 is to: