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?

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

15% chance.

step-by-step explanation:

3/10 times, the 5 year old will get a tablet. 5/10 times, the 13 yer old will get a tablet. multiply both fractions to get 15/100 times, both would have a tablet.