Answer:
9 in wide will the enlarge.
Step-by-step explanation:
Wayne has a recipe on 3 inch by 5 inch index card
Length and width of index card varies directly.
If we enlarge the length their width would be definitely enlarge.
Initial L = 3 in and Width = 5 in
[tex]L\propto W[/tex]
[tex]L=kW[/tex]
where, L=3 and W=5
Substitute L and W into formula
3=5k
[tex]k=\frac{3}{5}[/tex]
We need to find L when W=15
[tex]L=\frac{3}{5}\times 15\Rightarrow 9[/tex]
Thus, 9 in wide will the enlarge.
