HOW DO YOU SOLVE THIS USING EXCEL FORMULAS ONLY

Suppose that mathematics SAT scores are normally distributed with a mean of 500 and a standard deviation of 100, and the ACT scores are normally distributed with a mean of 18 and a standard deviation of 6. a) If a school only accepts students with SAT or ACT math scores in the top 10 percent, what are the minimum ACT and SAT scores that would be acceptable for that school? b) Same question, but for a school accepting the top 20%. c) Same question, but for a school accepting the top 60%.