This should be "wie viele" instead of "wie viel".
Both forms are correct.
https://www.duden.de/rechtschreibung/wie_viel
„Beispiele:
wie viel oder wie viele Personen nehmen teil?“
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This sentence was initially added as a translation of sentence #68772
added by Espi, June 23, 2011
linked by Espi, June 23, 2011
linked by sacredceltic, June 23, 2011
linked by slomox, June 24, 2011