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Maggie has a collection of music CDs. in Maggie's collections 5/7 of the CDs are "classical" and 2/8 of the CDs are "rock and roll" Maggie said that 7/15 of her collection is "classical" or "rock and roll" Glenn said that Maggie made an error explain whether Glen is correct or incorrect and why

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Find the LCM of each. 56 is the LCM. Then multiply 5 with 8 and 2 with 7. You should get 40/56 and 14/56. Add them together and then get it to decimal form. Then find the GCF and make your decimals into fractions. Your answer should be found there. :D

Help:                 
7, 14, 21, 28, 35, 42, 49, 56                 For extra help, create an equation.
8, 16, 24, 32, 40, 48, 56

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