The length of a rectangle is 15 cm and the width is 9 cm. If the length and width are both increased (2/3), the area of the current rectangle is much larger than the original one.
一个长方形长是15厘米、宽是9厘米，如果把长、宽都增加(2/3)，现在的长方形面积比原来多多少．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 + (2/3)</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">15 * (5/3) * 9 * (5/3)</gadget>
<output>375</output>

<gadget id="calculator">9 * (5/3) * 9</gadget>
<output>135</output>

<gadget id="calculator">375 - 135</gadget>
<output>240</output>

<result>240</result>