The school saved 14.7 tons of water in the first 3 days of this week, and saved an average of 5.6 tons of water per day in the last 4 days. How many tons of water was saved on average this week?
学校这个星期前3天节约用水14.7吨，后4天平均每天节约用水5.6吨，这个星期平均每天节约用水多少吨？
<gadget id="calculator">5.6 * 4</gadget>
<output>22.4</output>

<gadget id="calculator">14.7 + 22.4</gadget>
<output>37.1</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">37.1 / 7</gadget>
<output>5.3</output>

<result>5.3</result>