5.4 is 0.7 less than twice a number, what is this number?
5.4比一个数的2倍少0.7，这个数是几？
<gadget id="calculator">5.4 + 0.7</gadget>
<output>6.1</output>

<gadget id="calculator">6.1 / 2</gadget>
<output>3.05</output>

<result>3.05</result>