9 times larger
The reason is simple, all you need to do is 7 x 3, and 5 x 3, giving you the l x w of 15 and 21 inches. You multiply these numbers together, meaning the original length and width (l x w), which would be 5 and 7, which equals 35.
From here, you multiply 15 and 21, which gives you 315.
Divide 35 from 315, and see what you get!
Hope this helps!
