She can carry 18 pounds in total. She already has her lunch and her gym clothes inside her bag, which take up 1 + 2 = 3 pounds. Since 3 pounds are taken, that leaves 18 - 3 = 15 pounds for her books. Each book is 3 pounds, so she can carry 15/3 = 5 books in her backpack.
Probability hit=40%=4/10 probability no hit=1-p (hit)=1-4/10=6/10 probability= p(hit)+p(hit)+p(hit)+p(hit)+p(hit)+p (no hit)+p (no hit)+p (no hit) probability=4/10×4/10×4/10×4/10×4/10×6/10×6/10×6/10 =0.0022 ( I think but I'm not 100% sure)
