You paint one third of a wall and one for seven hours at that rate how long will it take you to paint one wall

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.

1/3x = 7

Now solve for x

1/3x * 3/1 = 7*3
x = 21

x = 21

The answer would be choice b