an 8 by 19 ft wall has three 4 by 5 ft windows. the area of the three windows is what percent of the area of the entire wall (including the windows) ?

39.5% (3 sf)

Step-by-step explanation:

Area of 1 window: 4*5 = 20 ft²

2 windows: 3*20 = 60ft²

Area of the wall: 8*19 = 152 ft³

Percentage of window area:

60/152 * 100 = 39.47368421%

= 39.5% (3 sf)