Paul can paint the area of a 12-by-8 ft wall in 15 min. China can paint the same area in 20 min.
a. In which equation does t represent how long it would take Paul and China to paint the area of a 12-by-8 ft wall together? Explain your choice.
i. 15t/96 + 20t/96 = 1/96
ii. (96)15t + (96)20t = 96
iii. 96t/15 + 96t/20 = 96
b. Solve all three equations in 9a.
c. How long would it take Paul and China to paint the wall together?