There is a flock of ducks, half of which are already swimming in the water, the other half are walking into the water, and the remaining 25 ducks are playing on the bank. Children, how many ducks are there in this group?
有一群鸭子，其中的一半已经在水里游，另一半的一半正在往水里走，剩下的25只鸭子在岸上玩．小朋友，这群鸭子共有多少只．
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">25 / (1/2) / (1/2)</gadget>
<output>100</output>

<result>100</result>