Three times a number is 0.9 greater than 4.5, what is this number?
一个数的3倍比4.5大0.9，这个数是多少？
<gadget id="calculator">4.5 + 0.9</gadget>
<output>5.4</output>

<gadget id="calculator">5.4 / 3</gadget>
<output>1.8</output>

<result>1.8</result>