Grant is painting a rectangular board that has a width of 1/3 foot. He has enough paint to cover 3 square feet. If he is able to cover the while board by using all of his paint, what is the length of the board in feet.

Length of the rectangular board=9 foot

Step-by-step explanation:

Width of the rectangular board=1/3 foot

Length of the rectangular board=x

Area of the rectangular board=3 square feet

Area of a rectangular board =Length × Width

3=x * 1/3

3=1/3x

Divide both sides by 1/3

3÷1/3=x

3*3/1 = x

9=x

x=9 feet

Therefore,

Length of the rectangular board= x = 9 foot

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: