1.3 times of a number is greater than 2.8 times of 16.4. Find this number.
一个数的1.3倍比16.4的3倍还要大2.8，求这个数．
<gadget id="calculator">16.4 * 3</gadget>
<output>49.2</output>

<gadget id="calculator">2.8 + 49.2</gadget>
<output>52</output>

<gadget id="calculator">52 / 1.3</gadget>
<output>40</output>

<result>40</result>