Zhang Hong’s family used 42 tons of water in the third quarter and 35 tons in the fourth quarter. How much more water did Zhang Hong’s family use in the third quarter than in the fourth quarter?
张红家第三季度用水42吨，第四季度用水35吨，张红家第三季度比第四季度多用水多少．
<gadget id="calculator">42 - 35</gadget>
<output>7</output>

<gadget id="calculator">7 / 35</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>