A canteen consumes 150 kWh of electricity in April, and saves (1/5) in May compared with April. How much kWh does the canteen save in May compared with April?
某食堂四月份用电150千瓦时，五月份比四月份节约(1/5)，食堂五月份比四月份节约用电多少千瓦时？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">150 * (1/5)</gadget>
<output>30</output>

<result>30</result>