Question

Melanie's bedroom walls are 45% painted. The area of her walls totals 420 square feet. What is the number of square feet of Melanie's walls that still need to be painted?

Answer 1

Answer:

The answer to your question is 231 ft²

Step-by-step explanation:

Data

Only 45% painted

Total area = 420 ft²

Area without paint = ?

Process

1.- Calculate the painted area using the rule of three

                     420 ft² ------------------- 100%

                       x         -------------------   45%

                       x = (45 x 420) / 100

                       x = 18900 / 100

                       x = 189 ft²

2.- Calculate the unpainted area

     Unpainted Area = 420 - 189

                                 = 231 ft²              

3.- Conclusion

Melanie still needs to paint 231 ft²