Help me to solve ques 10 and 11

Greetings,
Dear student,
For question number 10,
Given that,
Cost of 15 books = Rs. 750
Therefore, Cost of 1 book =  750/15 = 50 Rs.
Hence, number of books Ravi can buy in Rs 350 = 350/50 = 7 Books
Thank you.
Regards.

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Dear,
For Q.10 First take out how much 1 book costs? Answer is-750/15 = Rs.50
Then take out for Rs 350 as well!..Answer-7 books
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