I strewed some glutinous rice by the entrance, but there were some cheap rice grains mixed in them.
ご質問ありがとうございます。
"I strewed some glutinous rice by the entrance,"=「入口でもち米をばらまいた。」
"but there were some cheap rice grains mixed in them."=「でも、それには安い米が混ざっていた。」
追加情報:"strew"の同義語である"scatter"も使えます。(例文:"I scattered some rice grains.")
ご参考に。