2.5 times of a number is 3 greater than 5 0.4, find this number?
一个数的2.5倍比5个0.4大3，求这个数？
<gadget id="calculator">0.4 * 5</gadget>
<output>2</output>

<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">5 / 2.5</gadget>
<output>2</output>

<result>2</result>