In Xinghua Village, there were 110 households using natural gas in the year before last. Last year, the number of households using natural gas was four times that of the previous year. This year, the number of households using natural gas increased by 20 compared with last year. How many households use natural gas this year?
兴华村前年使用天然气有110户，去年使用天然气的户数是前年的4倍，今年使用天然气的又比去年增加了20户．今年使用天然气的一共多少户？
<gadget id="calculator">110 * 4</gadget>
<output>440</output>

<gadget id="calculator">440 + 20</gadget>
<output>460</output>

<result>460</result>