A community launched a "water conservation" campaign. A total of 130 tons of water was saved in the first 4 days of early March, and an average of 30.5 tons was saved per day in the last 6 days. How many tons of water did the plant save on average per day in early March?
一个小区开展"节约用水"活动．三月上旬前4天共节约用水130吨，后6天平均每天节约30.5吨，这个厂三月上旬每天平均节约用水多少吨？
<gadget id="calculator">30.5 * 6</gadget>
<output>183</output>

<gadget id="calculator">130 + 183</gadget>
<output>313</output>

<gadget id="calculator">4 + 6</gadget>
<output>10</output>

<gadget id="calculator">313 / 10</gadget>
<output>313/10 = around 31.3</output>

<result>313/10 = around 31.3</result>