y is proportional to x, and when x=1, y=3; then when y=1, what is x equal to
y与x成正比例，且当x=1时，y=3；那么y=1时，x等于多少
<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>