Write a proportion that could be used to solve for each variable.
Then solve.
121 bricks in 16.5 minutes
22 bricks in m minutes
a. 121/16.5 = 22/m; m = 3 c. 121/m = 22/16.5; m = 90.75
b. 16.5/121 = 22/m; m = 161 d. 121/16.5 = 22/m; m = 4.2