Question

The shoe store has twice as many black shoes as it does brown shoes. The total number of shoes is 66. How many brown shoes are there?

Answer 1

x=number of brown shoes
2x=number of black shoes (twice as many black shoes as brown shoes) 
so x+2x=66 
add like terms 3x=66
solve for x by dividing 3; x=22
so there are 22 brown shoes and 44 black shoes (2 x 22= 44)