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Quiz for Today(12/14/2017)

Alice told Jaclyn that she has an odd number of marbles in one hand and an even number of marbles in the other hand. Jaclyn said: What is the result if you multiply the number of marbles in your right hand by 3 plus the number of marbles in your left hand multiplied by 2. Alice told Jaclyn the total and Jaclyn told Alice right away which hand has the odd number of marble. How can she tell?