Math: percentage problem
posted by Anonymous .
A set of building blocks includes squares of various shapes and colors. If 20% of the blockers were square and 50% of the squares block are red, then ___ of the blocks are red squares.
My answer is 40% (20% x 50% / 100% = 40%). Is this correct?

No. Consider you have 100 blocks.
20 are square.
10 of the square are red.
That is ten percent of the blocks are red squares.
check my thinking. 
wow... thank you... i feel dumb now...