How do I write an equation for this situation?

Question

The Mackinac Bridge in Michigan is 1158 meters long.

The Tsing Ma Bridge in Hong Kong is 97 meters longer than the Golden Gate Bridge in California.  

Together, all three bridges have a length of 3815 meters.  

a) Which subject in the problem is represented by x? ______

b) What is your equation? (Go in order of Golden Gate, Tsing Ma and then Mackinac) _______________

Tsing Ma = ____ meters

Answer 1

x + Golden Gate Bridge

Mackinac Bridge (MB) = 1158

Tsing Ma Bridge (TMB) = Golden Gate Bridge x = (GGB) + 97

MB + TMB + x + x= 3815

Substituting: x+ 97 + x + 1158 = 3815

2x= 2560

x= 1280

TMB = 1280 + 97 = 1377 m