To my knowledge there are no fixed number of questions on these exams, eg a person taking this exam could have more or less questions, than the next person to sit the MB3-528 exam, in the same way that each exam will have different questions.
Do not worry about the amount of questions on the exam, rather concentrate on the objectives of the exam. If you know the objectives, the amount of questions become irrelative.
-Ken | http://ken.wagnerfamily.co.uk