4 times a number is 2.8, what is the number 9 times
一个数的4倍是2.8，这个数的9倍是多少
<gadget id="calculator">2.8 / 4</gadget>
<output>0.7</output>

<gadget id="calculator">0.7 * 9</gadget>
<output>6.3</output>

<result>6.3</result>