"You have to pay fifteen pesos."
Translation:Tienes que pagar quince pesos.
"Tiene que pagar quince pesos" and "tienen que pagar quince pesos" are not accepted. Also, not accepting deber forms.
I put, "Usted tiene que pagar quince pesos" and was told no, the correct solution: "Tienes que pagar quince pesos." Seems like my answer would be OK, but what do I know?
I put Tu (accent not available) tienes que pagar 15 pesos. That should be correct.
One thing I've notice, when translating from English to Spanish DL seems only to accept numbers that are written out. I assume it's because they want to make sure you actually know the numbers in Spanish.
If you wrote out QUINCE, and not the number 15 (as you've written above,) your answer looks correct to me.
Tener + que = something that has to be done. It is a Spanish construction you just have to memorize. "Tengo" for things I have (ownership), and "Tengo que" for things I have to do. I hope that helps.