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A man bought some oranges at Rs. 10 p...

A man bought some oranges at Rs. 10 per dozen and bought the same number of oranges at Rs. 8 per dozen. He sold these oranges at Rs. 11 per dozen and gained Rs. 120. The total number of oranges bought by him was `30\ doz e n s` b. `40\ doz e n s` c. `50\ doz e n s` d. `60\ doz e n s`

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