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SAT, 18.03.2021 05:50 djjdjdjdjdNfnd1941

Twenty seamstresses sew shirts for a clothing manufacturer and are grouped according to how many shirts per day each one can sew. seamstresses in group 1 can each sew 12 shirts per day and those in group 2 can each sew 15 shirts per day. together the seamstresses can sew 279 shirts per day. how many seamstresses are in group 1? a) 7
b) 9
c) 11
d) 13

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