hey there,
I did 290 and 291 last november. I got 55 and 65 questions. not sure which one is which. I realized there was a 40 question version at that time.
if you are with vue, you probably can guess how many questions you will have from their appointment time. you just login to vue website, and you will see how long your test going to last. and the thumb rule is about 2 mins per question for 270,271,272,290,291.
if you got plenty of time and less questions, maybe M$ think some of your questions are harder.
just my 2 cents