It is known that X+Y=50, X/Y=4, then what is X equal to
已知X+Y=50，X/Y=4，则X等于多少
<gadget id="calculator">50 / 5</gadget>
<output>10</output>

<gadget id="calculator">10 * 4</gadget>
<output>40</output>

<result>40</result>