column calculation. The sum of 3.2 times of a number and 5 times of this number is 61.5. Find this number?
列式计算．一个数的3.2倍与这个数的5倍之和是61.5，求这个数？
<gadget id="calculator">3.2 + 5</gadget>
<output>8.2</output>

<gadget id="calculator">61.5 / 8.2</gadget>
<output>7.5</output>

<result>7.5</result>