Question: 21

A bricklayer is making a design in the sidewalk. The sidewalk is 12 bricks wide. The bricklayer puts down 3 rows of red bricks, 1 row of white bricks, 3 rows of red bricks, and so on. If he needs to put down 100 rows of bricks, how many white bricks will he need?

120	240
300	900