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Two masters and apprentices process a batch of parts, 4 apprentices process food, and 3 masters process the batch first.

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It is known that it takes ten hours for the apprentice and six hours for the master to process this batch of parts alone. How many parts are there in this batch?

The work efficiency ratio between master and apprentice is 1:6=5:3

The master processes 3 more parts than the apprentice

3÷(5-3)×(5+3) =3÷2×8 =12

A: There are 12 parts in this batch.

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