Answer:
B has 1 fire truck
Explanation:
Using the variable 'b' for the number of fire trucks that station B has, then you can use the following expression for the number of fire trucks that station A has:
A = 2b + 1 (one more than twice as many as B)
If fire station A has three fire trucks, you can set the expression above equal to 3:
3 = 2b + 1
Subtract 1 from both sides: 3 - 1 = 2b + 1 - 1 or 2 = 2b
Divide both sides by '2': 2/2 = 2b/2
Solve for 'b': b = 1 fire truck