A street lamp is installed every 9 meters on one side of a road, and a total of 60 lamps are installed from the beginning to the end. How many meters is this road?
一条马路的一边每隔9米装一盏路灯，从头到尾一共装了60盏．这条马路长多少米？
<gadget id="calculator">60 - 1</gadget>
<output>59</output>

<gadget id="calculator">59 * 9</gadget>
<output>531</output>

<result>531</result>