Calculation: 21.49+52.37-0.4+5.51-11.37-6.6=how much.
计算：21.49+52.37-0.4+5.51-11.37-6.6=多少．
<gadget id="calculator">52.37 - 0.4</gadget>
<output>51.97</output>

<gadget id="calculator">5.51 - 11.37 - 6.6</gadget>
<output>-12.46</output>

<gadget id="calculator">21.49 + 51.97 + (-12.46)</gadget>
<output>61</output>

<result>61</result>