The sum of 3 times of a number and 2 times of this number is 30, what is this number?
一个数的3倍与这个数的2倍的和是30，这个数是多少．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>