The writing brush is 18.3 yuan more expensive than the ballpoint pen, and the pencil is 2.2 yuan cheaper than the ballpoint pen. How much is the writing brush more expensive than the pencil?
毛笔比圆珠笔贵18.3元，铅笔比圆珠笔便宜2.2元，毛笔比铅笔贵多少元？
<gadget id="calculator">18.3 + 2.2</gadget>
<output>20.5</output>

<result>20.5</result>