Cup A contains 180 grams of water, and Cup B contains 250 grams of water. How many grams of water is poured into Cup B to obtain the same amount of water in both cups.
甲杯有水180克，乙杯有水250克，乙杯往甲杯倒入多少克水后两杯水一样多．
<gadget id="calculator">180 + 250</gadget>
<output>430</output>

<gadget id="calculator">430 / 2</gadget>
<output>215</output>

<gadget id="calculator">215 - 180</gadget>
<output>35</output>

<result>35</result>