Li Hua's family used 160 tons of water in the whole year last year, and 67.85 tons in the first half of the year. How many tons more water in the second half of the year than in the first half?
李华家去年全年用水160吨，上半年用水67.85吨，下半年比上半年多用水多少吨？
<gadget id="calculator">160 - 67.85 - 67.85</gadget>
<output>24.3</output>

<result>24.3</result>