A rectangle with a length of 15 cm and a width of 9 cm is reduced by 1:3, what is the area of the figure obtained in square centimeters?
一个长15厘米，宽9厘米的长方形按1：3缩小，得到的图形面积是多少平方厘米．
<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">9 / 3</gadget>
<output>3</output>

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

<result>15</result>