Answer: 5cm
Step-by-step explanation:
Since the length of the shortest side of the green rectangle is equal to the length of the sides of the pink square, and that we know the area, we can divide the area by the length we know to find the long side of the green rectangle.
93.75 / 7.5 = 12.5
Now that we know the long side we can subtract 7.5 from that to get:
12.5 - 7.5 = 5
So the longest side of the yellow note is 5cm.