The school bought 15 meters of iron wire for the New Year's Day event in 2015. (1/5) of this iron wire was used up. How many meters were used?
学校为迎接2015年的元旦活动买来15米铁丝，用去了这根铁丝的(1/5)，用去了多少米．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 * (1/5)</gadget>
<output>3</output>

<result>3</result>