When the British system of units was first developed, what was the most common object used as a basis for measuring length? A. Automobiles B. Animals O C. The human body D. The king's castle​

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.