There are 3 feet in every yard.
So, to find out how many yards are in 10 feet, you would need to divide 10 by 3.
10 divided by 3 equals 3 and one third or 3 1/3.
To find out how many feet are you 5 yards you multiply 5 by 3.
5 times 3 is 15. So there are 15 feet in 5 yards.
To find out how many feet are you 5 yards you multiply 7 by 3.
7 times 3 is 21. So there are 21 feet in 7 yards.