Master Zhang has surrounded a rectangular vegetable garden with a fence of 300 meters. If the length of this rectangular vegetable garden is 90 meters, how many meters is the width?
张师傅用300米的篱笆围了一块长方形的菜园，如果这块长方形的菜园长是90米，那么宽是多少米？
<gadget id="calculator">300 / 2</gadget>
<output>150</output>

<gadget id="calculator">150 - 90</gadget>
<output>60</output>

<result>60</result>