We can put this word problem into an equation.
1/3x = 7
Now we just have to solve for x. To find x we need to multiply by three on both sides.
1/3x = 7
*3 *3
-------------
x = 21
So it will take 21 hours to paint one wall.
Answer:
the last one 
Step-by-step explanation:
Answer:
98.6
Step-by-step explanation:
in photo!!