The answer for this question is 12 magnets. Hope this helps!
For this case we have that if each package of pencils has 10 pencils we have:
Thus, we have a total of 90 pencils.
If Peter lost 18 pencils we have:
Thus, Peter has 72 pencils left.
Answer:
After losing 18 pencils, Peter has 72 pencils left.
Option A
B i think im not sure sorry