High School

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Elam is packing his room to move into a new house. A small box can hold 8 books without breaking, while a large box can hold 12 books without breaking. He has at most 160 books to pack and less than 30 boxes total. Let [tex]s[/tex] represent the number of small boxes and [tex]l[/tex] represent the number of large boxes. The inequalities [tex]s \geq 0[/tex] and [tex]l \geq 0[/tex] are part of the system that models this scenario.

Which inequalities complete the system?

A. [tex]s - 1 < 30[/tex]

B. [tex]8s - 12l \leq 160[/tex]

C. [tex]s + l < 30[/tex]

D. [tex]8s + 12l \leq 160[/tex]

E. [tex]s + l > 30[/tex]

F. [tex]8s + 12l \geq 160[/tex]

G.
\[
\begin{array}{l}
s + l < 30 \\
8s + 12l \geq 160
\end{array}
\]

Answer :

To solve the problem of determining the inequalities that model Elam's packing scenario, let's break down the conditions and requirements step-by-step:

1. Variables Defined:
- [tex]\( s \)[/tex] represents the number of small boxes.
- [tex]\( l \)[/tex] represents the number of large boxes.

2. Box Constraints:
- A small box can hold 8 books.
- A large box can hold 12 books.

3. Given Conditions:
- He has at most 160 books to pack.
- He can use less than 30 boxes in total.

4. Inequality Constraints:
- For the total number of books not exceeding 160, the inequality is:
[tex]\[
8s + 12l \leq 160
\][/tex]
This inequality ensures that the total number of books packed does not exceed 160, considering that each small box holds 8 books and each large box holds 12 books.

- For the total number of boxes being less than 30, the inequality is:
[tex]\[
s + l < 30
\][/tex]
This inequality limits the number of boxes (small plus large) to be less than 30, adhering to the constraint of using fewer than 30 boxes.

5. Non-Negative Constraints:
- Additionally, as given, [tex]\( s \geq 0 \)[/tex] and [tex]\( l \geq 0 \)[/tex] are included to ensure that the number of boxes can't be negative.

To summarize, the inequalities that complete the system for Elam's scenario are:
- [tex]\( s + l < 30 \)[/tex]
- [tex]\( 8s + 12l \leq 160 \)[/tex]

These represent the combined requirements based on the problem's conditions.

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Rewritten by : Barada