Monday, April 16, 2012

How many students ...

Thirty-two students took a nationwide exam and all the students from New York passed it. If the students from New York made up exactly 5% of the total number of the students that passed the test, how many students passed it and how many students were from New York?

Reference: Quick-to-Solve Brainteasers, J.J. Mendoza Fernandez





Puzzle Answer


Answer:
The number of passing grades is a whole number less than 32, and 5% of it is also a whole number. It can only be 20. If 20 is the number of passing grades, the number of students from New York that took the test is one.


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