The weight of 2 science fiction books and 1 autobiography is 5/6w pounds. What is the total weight of 4 of these science fiction books and 2 of these autobiographies?
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2science + 1 auto ----> 5/6w pounds
4science + 2 auto
= 2(2science + 1 auto)
= 2(5/6w)
= 5/3w pounds