You are a teacher and need to order supplies for your classroom. your principal gives you the expression 50n+15f+25p+20m that represents the cost in dollars, to purchase n cases of construction paper, f packages of pocket folders, p packs of pens, and m packs of markers. which statement below is not true?

Divide the price by the weight of all three to get the unit price then compare them. The lower unit cost is the best deal.

2.52 / 3.5 = 0.72 per pound

5.40 / 7.5 = 0.72 per pound

7.92 / 11 = 0.72 per pound.

They are all the same so she can buy whatever one she wants.

The answer is

d. Nellie should buy any size she wishes because they all have the same unit price.