"How many boats?"
Translation:Cia mheud bàta?
It's in the tips (I can see them in a browser, but not my phone Duolingo app): https://www.duolingo.com/skill/gd/Numbers/tips-and-notes
In English, how many takes the plural. The Gaelic phrase cia mheud always takes the singular. I believe it is because cia mheud actually translates as how much and Gaelic uses the singular, like English does with imperial measures: how much do you weigh? I weigh ten stone.