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If 12 more students passed the test. Since this is 3 times the students who fail the test, the number of students who passed the test would be 116 + 12*2 = 140 more students than the students who failed.

total students = 140/2 * 4= 280

Note: 12 * 2 is because if 12 more students passed the test, then the students who failed the test would be 12 less. Thus the difference between those passed and those failed would be 12*2 = 24 more from 116 students previously,

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