Put 5 pebbles at intervals of 5 meters on a straight line on the ground, place a basket on the extension line of the line where the pebbles are located, 10 meters away from the first pebble, an athlete starts from the place where the basket is placed, and picks up one pebble at a time Put the pebbles back into the basket, how many meters must you run to put all 5 pebbles into the basket.
把5粒石子每间隔5米放在地面一直线上，一只篮子放在石子所在线段的延长线上，距第一粒石子10米，一运动员从放篮子处起跑，每次拾一粒石子放回篮内，要把5粒石子全放入篮内，必须跑多少米．
<gadget id="calculator">10 + 15 + 20 + 25 + 30</gadget>
<output>100</output>

<gadget id="calculator">100 * 2</gadget>
<output>200</output>

<result>200</result>