A neighborhood association decided to plant a tree on every street. There are eighteen streets in the neighborhood. The association wanted every other tree to be a fruit tree, and they agreed to plant equal numbers of plum, pear, and apricot trees. How many of each kind of tree will they plant? Let's be accurate as possible.
Every other tree is half the trees, so there will be 18 / 2 = 9 fruit trees planted. The association is planting three kinds of fruit trees, so they will plant 9 / 3 = 3 of each kind of tree.
The answer: 3.