Answer is 3
Going from the original to the scaled image, we see that 1 ft turns into 3 ft. This is from multiplying by 3.
The same happens when we go from 2.3 to 6.9
2.3*3 = 6.9
Each dimension has been tripled.
Normally the original image is shown on the left because the reading order is usually left to right. So that could cause some confusion.
