Answer:
30 5/6 square feet
Step-by-step explanation:
We can calculate it with a direct rule of 3. If in 2/5 hour she can paint 12 1/3 square feet, how many square feet will she paint in one hour?
Let's notice that 12 1/3 = 37/3.
[tex]\text{2/5 hour} -\!\!\!-\!\!\!- \text{37/3 square feet}\\ \text{1 hour} -\!\!\!-\!\!\!- \text{x square feet}[/tex]
We use the formula of the direct rule of 3:
[tex]x = \frac {1*\frac{37}{3} } {\frac{2}{5} } \\ \\ x = \frac {\frac{37}{3} } {\frac{2}{5} } \\ \\ x = \frac{37}{3} * \frac{5}{2}= \frac{185}{6}[/tex]
x = 185/6 = 30 5/6 square feet
She can paint 30 5/6 square feet in one hour.
