4X=2, X+Y=2.5, then what is Y equal to
4X=2，X+Y=2.5，则Y等于多少
<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">2.5 - (1/2)</gadget>
<output>2</output>

<result>2</result>