One pack of sunflower seeds cost $4.50 a pack of other seeds cost $3.50 you buy the same number of packs of each type of seeds and you spend $40 how many packs did you buy?

I bought a total of 10 packs. 5 packs of sunflower seeds and 5 packs of other seeds.

one pack sunflower seeds = $4.50

one pack other seeds = $3.50

number of packs bought = x/2 * x is equally divided between the two kinds of seeds.

4.5 (x/2) + 3.5 (x/2) = 40

4.5x/2 + 3.5x/2 = 40

(4.5x + 3.5x) / 2 = 40

8x/2 = 40

(8x/2) * 2 = 40 * 2

8x = 80

8x/8 = 80/8

x = 10

to check:

4.50 (x/2) + 3.50 (x/2) = 40

4.50 (10/2) + 3.50 (10/2) = 40

4.50 (5) + 3.50 (5) = 40

22.50 + 17.50 = 40

40 = 40