Question

Hinto is planning to paint the walls of a bedroom that is 20 ft long, 15 ft wide, and 8 ft high. If Hinto has 1 gallon of paint that covers 400 Sq ft, how many additional gallons of paint does he need?

Answer 1

Okay so you have 2 walls that are 15 ft x 8 ft.
\[15\times8=120\]
Then you have 2 other walls that are 20 ft x 8 ft.
\[20\times8=160\]
So 2 walls of 120 sq ft. = 240
& 2 walls of 160 sq. ft. =320
\[320+240=560\]
So you have a total of 560 sq ft. to paint. Since 1 gallon only covers 400 sq. ft, you will only need two total gallons to paint the room. Since Hinto already has one, he'll need one more additional gallon of paint.

Answer 2

You might want to provide the student with a hint first. It would be better if you did not give the complete solution.