Today's riddle reads, "All the girls of Mary's class are standing in a row. Mary is the 11th girl from both ends. How many girls are studying in Mary's class?" Think hard about what position she is in and how many girls will be on each side of her. Give it your best shot! If you think you know the answer, take a guess and check to see if it's right. Afterwards, share this with all of your friends to pass it on and see if they can find it too!