Question 202915
Let BL = the number of black shoes and BR = the number of brown shoes.
From the problem statement:
1) BL = 2*BR  "the shoe store has twice as many black shoes as it does brown shoes."
2) BL+BR = 66  "the total number of shoes is 66."
Rewrite equation 2) as:
BL = 66-BR and substitute this into equation 1).
(66-BR) = 2*BR Add BR to both sides of the equation.
66 = 3*BR  Divide both sides by 3.
22 = BR
There are 22 brown shoes.