Vera spent 7 cents on bird and cat stickers for her little sister. Bird stickers cost 1 cent each and cat stickers cost 2 cents each. If Vera bought exactly 4 stickers, how many of each did she buy?
you have to guess and check the word problems
?=bird stickers
?=cat stickers

3 cat stickers and 1 bird sticker

Step-by-step explanation:

To guess, 7 cents total and values of 2 and 1.

I calculated how many times 2 went into 7 and then used the remainder of 1 for the other sticker.

3(2) + 1(1) = 7  

To solve mathematically, set up a system of equations:

Value:  2x + 1y = 7

Quantity: x + y = 4

10=2 x 5

12=2 x 2 x 3

40=2 x 2 x 2 x 5

COMMON FACTORS=2