The ratio in size of Gabriel's room to her brother Giorgio's room was 5:3. The area of Gabrielle's room was 240 square feet. If Giorgio's room was square-shaped, what was the length of his room?

240:144

Step-by-step explanation:

5:3

240 : 5 = 48

48 * 3 = 144

In other words ...

240 (Gabriel's room size) : 5 (Gabriel's original room size) = 48

so if 5 times 48 = new number

then ... 3 times 48 = answer!