Question

Stefanie is painting her bedroom. She can paint

12 1/3 square feet in 2/5 hour. How many sqare feet can she paing in one hour.

Answer 1

2/5= 12/1/3 feet
1 hour = 30/5/6 feet

Answer 2

30 5/6 square feet

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.

`\text{2/5 hour} -\!\!\!-\!\!\!- \text{37/3 square feet}\\ \text{1 hour} -\!\!\!-\!\!\!- \text{x square feet}`

We use the formula of the direct rule of 3:

`x = \frac {1*(37)/(3) } {(2)/(5) } \\ \\ x = \frac {(37)/(3) } {(2)/(5) } \\ \\ x = (37)/(3) * (5)/(2)= (185)/(6)`

x = 185/6 = 30 5/6 square feet

She can paint 30 5/6 square feet in one hour.