Nola purchased2.5 lb of cheese for $10.50 her mother purchased 3 pounds of the same cheesefor $12.60 the cost of she's varies directly with the number of pounds purchased how much does one pound of cheese the cost?

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

cross multiplying, we get :

⇒ (3) × (5) = (9) × (x)

⇒ 15 = 9x