The sum of a number plus 4 is multiplied by 2.5, and the product is 14. What is this number?
一个数加上4的和，乘2.5，积是14．这个数是多少？
<gadget id="calculator">4 * 2.5</gadget>
<output>10</output>

<gadget id="calculator">14 - 10</gadget>
<output>4</output>

<gadget id="calculator">4 / 2.5</gadget>
<output>1.6</output>

<result>1.6</result>