Final answer:
Nikki bought 12 pencils.
Step-by-step explanation:
To find the number of pencils Nikki bought, we first need to calculate how much money she spent on the folders. Since each folder costs $0.68 and she bought 4 of them, the total cost of the folders is $0.68 x 4 = $2.72. Next, we subtract the cost of the folders from the initial money she had: $5 - $2.72 = $2.28.
Since each pencil costs $0.19, we can now find the number of pencils she bought by dividing the remaining money she had by the cost of each pencil: $2.28 ÷ $0.19 = 12 pencils.
Therefore, Nikki bought 12 pencils.