The sum of 2.9 minus a number plus 0.3, divided by 2 is 0.6, what is this number?
2.9减去一个数再加上0.3的和，除以2的商是0.6，这个数是几？
<gadget id="calculator">2.9 / 2</gadget>
<output>1.45</output>

<gadget id="calculator">0.3 / 2</gadget>
<output>0.15</output>

<gadget id="calculator">0.15 - 0.6</gadget>
<output>-0.45</output>

<gadget id="calculator">1.45 + (-0.45)</gadget>
<output>1</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 / (1/2)</gadget>
<output>2</output>

<result>2</result>