Answer:
[tex]15G+21a[/tex]
Step-by-step explanation:
Let G represent cost of each bottle of grape juice and a represent the cost of each bottle of apple juice.
We have been given that a verity pack of juice includes 5 bottles of grape juice and 7 bottles of apple juice.
The cost of 5 bottles of grape juice would be [tex]5G[/tex] and cost of 7 bottles of apple juice would be [tex]7a[/tex].
Since one verity pack includes 5 bottles of grape juice and 7 bottles of apple juice, so cost of one variety pack would be [tex]5G+7a[/tex].
The expression for total cost of three verity packs would be three times cost of one verity pack that is [tex]3(5G+7a)[/tex]
Let us simplify our expression as:
[tex]3*5G+3*7a\Rightarrow 15G+21a[/tex]
Therefore, our required expression would be [tex]15G+21a[/tex].
