LearnMate: Ayudante de tareas

For starters, my answer that I got would be let’s say 21, then the app says it like 30. So then I read the instructions and it says that the answer is 21, so then I get really confused. Also, you would want to get to the next question and then an ad pops up out of nowhere like I was about to finish typing in the answer and an ad pops up. They need to fix this or else I will never use this app ever again.