Answer:
24.5 ft.
Step-by-step explanation:
40 divided by 2 is 20.
14 divided by 2 is 7.
20 times 3 is 60
7 times 3 is 21 ft.
Since you're trying to get to 70ft long just add 10 instead of 20.
That mans you are only adding 3.5 to 21.
My answer should be right but my work is pretty bad lol.