Kayra has a rock collection when she put her rocks into 2equal piles there are no rocks left over when she puts her rocks into 3 equal piles there are still no rocks left over when she puts her rocks into 4 equal piles there are still no rocks left over how many rocks could kyra have

Abox contains 1 plain pencil and 4 pens. a second box contains 5 color pencils and 5 crayons. one item from each box is chosen at random. what is the probability that a plain pencil from the first box and a color pencil from the second box are selected? write your answer as a fraction in simplest form.