Riddle #1 - My Age

When my sister was born,  my father had five times my age. Last year, he had four times my age. When my sister will have double the age she has today, my father will have the triple of my age. What is my age?

Math Problem #2 - Triangle Area

In the following figure, [AD] measures 1/3 of [AB] and the points E and F divide [BC] in three equal parts. Knowing that the area of [ABC] is 9 , what is the area of the grey part [ADEF]?

Math Problem #1 - 9 Dots

Without lifting your pen connect this 9 dots with 4 lines.

Solution