So let's break this question down. You need a bit of both, right? Well we need to calculate how many multiple choices we can do whilst having true/false questions, and not going over or under on points.
So, let's pick a random number, 5. So let's do 8x5, that equals 40. ohmygoditsrightiwasseriouslyjustguessing Ok so now we have our number, 5 multiple choice questions. The true/false questions should be easy, just do 3x20 and you get 60.