Question

If 1 gallon of paint covers 400 square feet, about how many gallons of paint are needed to paint the exterior of a spherical tank of a diameter 30 feet? Use π ≅ 3.14.

Answer 1

                                           = 

                                           = 

 

                                           =   

Now,

According to the question,

400 ft² needs 1 gallon of paint

1 ft² needs (1 / 400) gallon of paint

1256.64 ft² needs (1 / 400) * 1256.64 gallon of paint

                       = 3.1416 gallon of paint

                       = 3.14 gallon of paint --------------> rounded

So, we need 3.14 gallon of paint

Answer 2

Answer:

8gallon

Step-by-step explanation:

diameter=30 ft.

radii=30/2

=15ft

area=4πr^2

=4*3.14*225

=2826

to cover 400ft^2,paint require. =1 gallon

to cover 1ft^2,paint require. =1/400 gallon

to cover 2826ft^2,paint require=1/400*2826

=7.065=8gallon