The time (minutes) vary directly with the number of walls and inversely to the number of people.
m = kw/p, where m = minutes, w = walls, and p = people
60 = 5k/7
420 = 5k
84 = k m = 10(84)/10
m = 84
It takes 84 minutes for 10 people to paint 10 walls.
7 to 4 is the ratio of salsa jars to salsa bags
The angle must be obtuse.
Area of hexagon = 3√3 / 2 (18^2) = 842
area of rectangle = 18 * 21 = 378
area of shaded = 842 - 378 = 464
answer
A. 464 square units