Calculate how much 40/16*2.5-1=.
计算40/16*2.5-1=多少．
<gadget id="calculator">40 / 16</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * 2.5</gadget>
<output>6.25</output>

<gadget id="calculator">6.25 - 1</gadget>
<output>5.25</output>

<result>5.25</result>