Question

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7. Serena estimates that she can paint 40 square feet of wall space every half-hour. Can Serena paint at least 180 square feet of wall space in 2.5 hours? Why or why not?


A. Yes, 180(2.5)= 450, and 450 > 180


B. Yes, 80(2.5) = 200, and 200 > 180


C. No, 40(2.5) = 100, and 100 < 180


D. No, 80(0.5)= 40, and 40 < 180

Answer 1

B. Yes, 80(2.5) = 200, and 200 > 180

Explanation:

1. Addition:

If Serena can paint 40 square feet in 30 minutes, then:

40 + 40 = 80 sq. ft.

30 + 30 = 1 hour

80 + 40 = 120 sq. ft.

60 + 30 = 1.5 hours

120 + 40 = 160 sq. ft.

90 + 30 = 2 hours

160 + 40 = 200 sq. ft.

120 + 30 = 2.5 hours

So, what I just did was adding the 30 minutes and the 40 square feet at the same time until I got to 2.5 hours, and seeing if I also got to 180 square feet. Which I did. I actually got to 200 sq. ft. That means our answer is B. Yes, 80(2.5) = 200, and 200 > 180

Solution:

B. Yes, 80(2.5) = 200, and 200 > 180

I hope my answer helped you! If you need more information or help, comment down below and I will be sure to respond if I am online. Have a wonderful rest of your day!