W, Y, Z and X can be replaced by one of 1, 2, 3 and 4 respectively, if the equation ((W)/(Z))-((Y)/(X))=1, then What is the sum of X+Y
W、Y、Z和X分别可用1，2，3，4中的一个数代替，如果能使等式((W)/(Z))-((Y)/(X))=1，则X+Y的和是多少
<gadget id="calculator">2 + 4</gadget>
<output>6</output>

<result>6</result>