Carol's bookshelf has4 shelves with6 books on each. Her brother Robert has 3 shelves with 7 books on each. They want to combine their books. If they put 9 books on a shelf, how many shelves will they need?

This is clearly a university level question.

answer = ⌈(4*6 + 3*7)/9⌉ = 5

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is this answer right

First you have to (4*6) and (3*7) you get your answer for both of them and then you add them and you divide the answer you got with (4*6) and (3*7) with nine-9 and your answer is 5.

To solve this problem, first, let's find out the total number of books on Carol's bookshelf and Robert's bookshelf separately.

Carol's bookshelf:
Carol has 4 shelves with 6 books on each shelf. So, the total number of books on Carol's bookshelf can be calculated by multiplying the number of shelves (4) by the number of books on each shelf (6).
Total number of books on Carol's bookshelf = 4 shelves * 6 books per shelf = 24 books.

Robert's bookshelf:
Robert has 3 shelves with 7 books on each shelf. So, the total number of books on Robert's bookshelf can be calculated by multiplying the number of shelves (3) by the number of books on each shelf (7).
Total number of books on Robert's bookshelf = 3 shelves * 7 books per shelf = 21 books.

Next, let's find the total number of books they have when they combine their books:
Total number of books = Total number of books on Carol's bookshelf + Total number of books on Robert's bookshelf.
Total number of books = 24 books + 21 books = 45 books.

Now, we need to determine how many shelves they will need if they put 9 books on each shelf. To find that, we divide the total number of books (45) by the number of books per shelf (9).
Number of shelves needed = Total number of books / Number of books per shelf.
Number of shelves needed = 45 books / 9 books per shelf = 5 shelves.

Therefore, Carol and Robert will need 5 shelves to accommodate all their books if they put 9 books on each shelf.

(4 * 6) + (3 * 7) / 9 = ?

Are you sure