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πŸ‘· Grade 6-7

Work Rate Problems

πŸ“ Sample Problem
A mα»™t mΓ¬nh lΓ m xong 6 giờ. B mα»™t mΓ¬nh lΓ m xong 4 giờ. CΓΉng lΓ m bao lΓ’u?
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