Answer:
They have too much caramel.
Explanations:
According to the given information, if Ari thinks the perfect milkshake has 3 spoonfuls of caramel for every 5 scoops of ice cream, then the 6 spoonsful of caramel based on Ari's proportion will have:
According to Freeze Zone, he makes batches of milkshakes with 6 spoonfuls of caramel and 8 scoops of ice cream.
Get the ratio of scoops of ice cream used for every 6 spoonsful of caramel used by both:
Since Ari's ratio (proportion of both ingredients) is greater than that of Freeze Zone's, hence, Ari will think that Freeze Zone's milkshakes have too much caramel.
Note that the lower the amount of icre cream used, the greater the amount of caramel proportion.