A swimming pool is 20 meters long. Xiao Ming has swum four rounds in the swimming pool. How many meters does he have in total?
一个游泳池场20米，小明在游泳池中已经游了4个来回，他共有了多少米．
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<result>160</result>