It is known that x+y=75, x/y=4, then x=how much
已知x+y=75，x/y=4，则x=多少
<gadget id="calculator">75 / 5</gadget>
<output>15</output>

<gadget id="calculator">15 * 4</gadget>
<output>60</output>

<result>60</result>