Hongxing Primary School carried out water conservation activities, and saved 28 tons of water in the first half of the year, which was the second half of the year (4/7). How many tons of water were saved in the second half of the year?
红星小学开展节约用水活动，上半年节约用水28吨，是下半年的(4/7)，下半年节约用水多少吨？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">28 / (4/7)</gadget>
<output>49</output>

<result>49</result>