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    help on some math questions???anyone?

    I have some math questions: Reform the indicated operation. write in lowest terms. #8. 2 2/5 times 1 6/7? #10. 2 2/5 divide 6? #12. 1 1/6+4 3/5? #14. 50 1/4-32 2/3? #20. what is the least common denominator for 3/4 and 2/7? Does any one know these? it would be greatly appreciated. thank you.