Answer:- There were only three because there was a grandmother a mother and a daughter. The mother was the daughter to the grandmother and she was the mother to the mother and the daughter was the daughter to the mother.
Answer:- There were four pears (2 pairs) on the tree. The first man took a pair (2 pears) and the second only took one pear leaving one pear on the tree.
Answer:- 3. 3 squared is 9. 3+9=12. Take the two digits of the summation and add them; 1+2=3. In short; 3-9-12-3. This can also work with the number 0 and 9.