It would be perpendicular lines
In this question,We have to group the given expression to get 5 as the final answer .

Here we put 5 +20 in parenthesis, that is

And we do the required operations, that is

And we get 5.
Here's one way:
A=WxL
So in this case, it's 2x5
You would draw the rectangle, label one side 2 in. and the other 5 in. Draw an arrow from each no./side and put x underneath the line so that its 2 —x— 5 (2, line, x, line, 5. With x under line)
Six less than "b"
i think this would be the answer
good luck!!