A bridge that is constructed across a river has 3 spans. The clear distance between the two piers of the bridge is 20 meters. The width of each pier of the bridge is 5 meters. Estimate the length of the bridge.
- A70 mCorrect
- B75 m
- C80 m
- D85 m
Solution
Concept
Total length
Step-by-step solution
1. 3 × 20 + 2 × 5 = 70 m.
Explanation
Spans plus piers.
Why the other options are wrong
Others do not follow.
Shortcut
n spans + (n−1) piers.
Correct answer: A) 70 m