Question

How many 1-foot-square border tiles would you need to surround a pool
that is 10 feet long and 5 feet wide? *

Answer 1

34

It is 34 because it is
10+10+5+5=30
when it comes to simply the edge lengths but to completely surround the pool you would need the 4 extra tiles on the corners which makes it
10+10+5+5+4=34