This can't have anything to do with Mensa. You get a daily problem and within the first dozen or so a few have been ambiguous and the questions are often written with poor grammar. Here's an example of a ridiculous question that prompted me to delete the app:
"For breakfast five people have bacon, seven have sausage and 10 have cornflakes, how many have toast?"
Yes, the commas are included/missing as originally written.
Rated at the highest difficulty rating, you have to wonder if it's because of the horribly worded sentence. You can't convince me that there is enough info there to answer that question.
Another math question asked to find an answer in minutes but when it ended up as a number with a decimal I put down the entire answer and was marked wrong because I didn't round to the nearest whole number. Fractions of a minute do have a direct correlation to a unit of measurement called seconds.
This app has nothing to do with intelligence or building someone's reasoning skills. At least I didn't lose any money but all the same, someone is scamming the Mensa name to try to get downloads.