It depends on what level of people are competing. If it's anything from middle school to high school, you might see something like:
What is the largest 2-digit integer that is 7 times the sum of its digits? For example, 21 = 7 x (2 + 1)
For college-level competitions you'd see harder: trig, calculus, number theory, etc.
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accounting is basic math so you kind of need it to do accounting
Structural engineering uses a tremendous amount of math.
A Jacobian is a kind of matrix.
A peditrician might need to use math to determine the kind of disease for probabilities.
Math 1333 or higher is used in a accountant major.