In 12 weeks as the lowest common number between them is 12
4+4+4=12
3+3+3+3=12
2+2+2+2+2+2=12
the inequality goes from -30 and all number up but not including -30 because it has open circle. so mark all number greater than -30
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Out of 170 students in 12th grade, 27+23 = 50 students have more than 1 college in mind.
So 50/170, or 29% is your answer.