Give the step-by-step reasoning process and then the final answer. Samir climbed 318 stairs yesterday. Veronica climbed 18 more than half that amount. How many stairs did Veronica and Samir climb together yesterday?
Half of 318 is 159. 159 + 18 = 177 stairs. 318 + 177 = 495. Together they climbed 495 stairs yesterday.
The final answer: 495.