rectangular pool, its length is 15m, its width is long (1/3), how many square meters is the area of this pool?
一个长方形的水池，它的长是15m，宽是长的(1/3)，这个水池的面积有多少平方米？
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

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

<gadget id="calculator">15 * 5</gadget>
<output>75</output>

<result>75</result>