Answer:
Probably 15
Step-by-step explanation:
5 x 3 = 15?
If she wants the area to be 3 times as big,
then it'd be 5 x 4.5 x 3 = 67.5cm^2
But in this case it's asking for the length of the pen.
Assuming it's 5x3, which is 15
Hope this helps but sorry if this isn't accurate :')
