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To get 11 you'd probably have to forget everything you ever learned about fractions. Seriously, though, 1/3 of 12 is 4, and 3/5 of 7 is 4.2, so when you add them you should get 8.2 (or 41/5, or 8 1/5). 11 is way off.

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17y ago

What else can I help you with?