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solving word problem
of the 911 girls at East Statistics H.S. last year, 98 played fall sports, 91 played winter sports, and 84 played spring sports. 22 girls played sports all 3 seasons while 30 played only in the fall, 20 played only in the winter, and 10 played only in the spring. how many girls did not play sports in any of the 3 seasons?