Math Brain Teasers

When I was six yrs old my brother was half my age. I am now 20 yrs old. How old is my brother?

Solve the following.

A farmer had 17 sheep and all but nine die. How many are left?

Determine the total number of balls that would make up the figure shown.

You're running in a 500 m race and overcame the person in 2nd place. At what place are you in?

How many triangles are shown in the picture below?

If there are three apples and you take two away, how many do you have?

What comes next in the sequence 2, 4, 8, 10, 20, ___ ?

What is the value of the square in the picture shown?