Uncle Wang’s family used 2.5 tons of water last month and spent 10 yuan. According to this calculation, they spent 8 yuan on water this month. How many tons of water did Uncle Wang’s family use this month?
王叔叔家上个月用了2.5吨水花了10元钱，照这样计算，这个月用水花了8元钱，王叔叔家这个月用了几吨水？
<gadget id="calculator">10 / 2.5</gadget>
<output>4</output>

<gadget id="calculator">8 / 4</gadget>
<output>2</output>

<result>2</result>