There are 80 animals in the natural zoo. Among them, 15 animals liked to eat both grass and leaves, 23 animals did not like to eat leaves and grass, and 10 animals did not like to eat grass. So, how many animals are there that only like to eat grass?
天然动物园里有80只动物．其中既喜欢吃草又喜欢吃树叶的动物有15只，树叶和草都不喜欢吃的动物有23只，不喜欢吃草的动物有10只．那么，只喜欢吃草的动物有多少只？
<gadget id="calculator">80 - 23 - 15</gadget>
<output>42</output>

<gadget id="calculator">42 - 10</gadget>
<output>32</output>

<result>32</result>