I DON’T UNDERSTAND?! Please help! :[[ 10 points?

Sarah asked: this is the question…
Sarah uses balso wood to build airplane models. After completing a model, she had a strip of balso wood measuring 7/8 of a yard left over. Shawn wants to buy half of the strip from Sarah. What fraction of a yard does Shawn want to buy?
Can someone explain how you [...]