# Math

Mr. Smith has 4 daughters. Each of his daughters has a brother. How many children does Mr. Smith have?

# Math

A bat and a ball cost $1.10. The bat costs one dollar more than the ball. How much does the ball cost?

# Math

I am as simple as a circle, worthless as a leader; but when I follow a group, their strength increases tenfold. By myself I'm practically nothing. What am I?