Answer:
a, [tex]Books = 315[/tex]
b, [tex]Total = 20s + 45l[/tex]
Step-by-step explanation:
Given
[tex]Small\ Box = 20[/tex]
[tex]Large\ Box = 45[/tex]
Solving (a): Books using 5 small and 7 large boxes;
This is calculated as follows
[tex]Books = Size * quantity[/tex]
For Small box
[tex]Books = 20 * 5[/tex]
[tex]Books = 100[/tex]
For large box:
[tex]Books = 45 * 7[/tex]
[tex]Books = 315[/tex]
[tex]Total = 100 + 315[/tex]
[tex]Total = 415\ books[/tex]
Solving (b): s small and l large
We use the same concept as (a) above:
For Small Box
[tex]Books = 20 * s[/tex]
[tex]Books = 20s[/tex]
For large box
[tex]Books = 45 * l[/tex]
[tex]Books = 45l[/tex]
[tex]Total = 20s + 45l[/tex]