Ladle, Big Dipper, Measure Of Volume, Eighteen Liters
noun
How much can you hold in this ladle? Why, exactly eighteen liters of course! Eighteen is your favorite number, how convenient.
と
The reading is the same as the one you learned with the kanji.
一斗のお米が入った袋は置いてますか？
Do you have a bag of 18 liters of rice?