Final answer:
To find the number of stickers Reann started with, we can use addition and subtraction operations. By setting up an equation, we can solve for the value of x. In this case, Reann started with 8 stickers.
Step-by-step explanation:
To solve the problem, we need to use addition and subtraction operations. Let's assign a variable to the number of stickers Reann started with. Let's say x. Reann gives her friend half of the stickers, which is x/2. Then, her brother gives her 8 new stickers. Therefore, she has x/2 + 8 stickers. Finally, we can set up the equation x/2 + 8 = 12 to find the value of x. To isolate x, we can subtract 8 from both sides, giving us x/2 = 4. Finally, multiplying both sides by 2, we find that x = 8.
Learn more about Solving for an unknown number using addition and subtraction