Nake's family paid a total of 30 yuan for water and electricity last month, and the ratio of electricity to water was 2:3. How much more was the water bill than the electricity bill?
纳克家上月共付水电费30元，其中电费与水费的比是2：3，水费比电费多付多少元．
<gadget id="calculator">2 + 3</gadget>
<output>5</output>

<gadget id="calculator">30 / 5</gadget>
<output>6</output>

<result>6</result>