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We know that
• They sold to one customer 5 peanut butter biscuits for $3.
,• To another customer, 7 beef treats for $4.20.
Using the given information, we form the following proportion
[tex]\frac{5}{3}=\frac{7}{4.20}[/tex]Then, we divide to see if these ratios are equivalent
[tex]1.66\ldots=1.66\ldots[/tex]As you can see they are equal.
The cross product of the proportion would be
[tex]\begin{gathered} 5\cdot4.20=7\cdot3 \\ 21=21 \end{gathered}[/tex]