Draw a picture with a length of 10 cm and a width of 6 cm. If the length is reduced to 2.5 cm, according to this ratio, how many cm should the width be reduced to?
画一张长10cm、宽6cm的图，如果长缩小为2.5cm，按照这个比例，宽应缩小为多少cm．
<gadget id="calculator">6 * 2.5</gadget>
<output>15</output>

<gadget id="calculator">15 / 10</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>