Which is a better buy 2 yds of cloth for $3.15 or 6yds of cloth for $7.78

The better buy here is buying 6 yards of cloth for 7.78$. The way you find it out is by dividing 3.15$ by 2 which will get you 1.58$ per cloth. The second one is you divide 7.78$ by 6 yards and you will get 1.30$ per cloth. So the way to figure out the answer is which is the lowest amount of money for the most cloth and buying 6 yards of cloth for 7.78$ for a unit price of 1.30$ each is the better deal. Also another way of doing it can be by doing 3.15 x 6 =9.45$ so you already know that the second one was a better deal.

Simplified -

6 yards of cloth for 7.78$ is the better deal because it has a better unit price at 1.30$ than the first deal.

Hope I helped!!!