If a railing needs to be 18 1/3 feet long if two pieces of wood are each 7 1/2 feet long ,how long must the third piece be

Question

the railing needs to be 18 1/3 feet long

Answer 1

length of third piece = x

 

railing needs to be 18 1/3 feet long

 

18 1/3 = 55/3 feet

 

 

 

two pieces of wood are each 7 1/2 =15/2 feet

 

 length of  two pieces = 2 * 15/2 = 15

 

x + 15 = 55/3

 

3x + 45 =55

 

3x = 10

 

x =10/3=3 1/3 feet

 

length of third piece = x= 3 1/3