2014 Grade Six Mathematics Volume 2 mid-term test question: A rectangle with a length of 5cm and a width of 3cm is enlarged by 3:1, what is the area of the obtained figure?
2014年六年级数学下册期中试题：一个长5cm、宽3cm的长方形按3：1放大，得到的图形的面积是多少．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

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

<gadget id="calculator">15 * 9</gadget>
<output>135</output>

<result>135</result>