(1-((3/8)+(1/4)))/(1/4).
(1-((3/8)+(1/4)))/(1/4)．
<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(3/8) + (1/4)</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 - (5/8)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) / (1/4)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>