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ipn [44]
2 years ago
12

A bookstore has 36 copies of the latest bestseller and they fit exactly on 3 shelves. The bookstore ordered another 120 copies.

How many shelves do they need to fit all their copies of the book?
Mathematics
1 answer:
lesya [120]2 years ago
5 0

Answer:

13

Step-by-step explanation:

First, to find out how many book fit on one shelf, you will need to divide the total number of books by the toal number of shelves:

36 books / 3 shelves = 12 books/shelf

Because the question says that the bookstore order <em>another</em> 120 copies, this is means that the 120 books is in addition to the original 36 books.

Because we already know that the 36 books require 3 shelves, we still need to find how many shelves 120 books needs. So, we can divide books by number of how many books <em>can</em> fit on a shelf:

120 books / 12 books per shelf = 10 shelves

So to find the total number of shelves needed, add the number of shelves together:

3 + 10 = 13 shelves

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BA\Rightarrow\begin{bmatrix}3 & 6\\ -1 & 1\end{bmatrix}\begin{bmatrix}1 & 3\\ 2 & 1\end{bmatrix}\\BA\Rightarrow\quad \begin{bmatrix}3\times 1+6\times 2 & 3\times 3+6\times 1\\(-1)\times 1+1\times 2 & (-1)\times 3+1\times 1\end{bmatrix}\\BA\Rightarrow \quad \begin{bmatrix}15 & 15\\ 1 & -2\end{bmatrix}

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