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I hate 4th grade math
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Each student says one number, so the answer is 20. 5+4=9 1st person 9-1=8 2nd 8+4=12 3rd 12-1=11 4th 11+4=15 5th 15-1=14 6th 14+4=18 7th 18-1=17 8th 17+4=21 9th 21-1=20 10th
