A rectangular picture frame is 50 cm wide and twice as long as it is wide. If a decorative strip is nailed along the frame, how many meters is the decorative strip?
一个长方形的画框，宽50厘米，长是宽的2倍，如果沿框边钉上装饰条，装饰条长多少米？
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">150 * (1/50)</gadget>
<output>3</output>

<result>3</result>