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Mathematics, 28.10.2019 21:31 kleshead

Andy cut a tuna sandwich and a chicken sandwich into a total of 21 same size-pieces. he cut the tuna sandwich into 15 more pieces than the chicken sandwich. andy ate 12 pieces of the tuna sandwich.
what fraction of the tuna sandwich did he eat?

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Andy cut a tuna sandwich and a chicken sandwich into a total of 21 same size-pieces. he cut the tuna...
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