A factory saves 2 tons of water every day, how many tons of water is saved in total from March to May?
某工厂每天节约用水2吨，求3-5月份一共节约用水多少吨？
<gadget id="calculator">31 + 30 + 31</gadget>
<output>92</output>

<gadget id="calculator">2 * 92</gadget>
<output>184</output>

<result>184</result>