The head of a fish weighs 15 kg, which is 1/5 of the weight of the whole fish. How much does the fish weigh?
一条鱼的鱼头重15千克，是整条鱼体重的(1/5)，这条鱼重多少千克．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">15 / (1/5)</gadget>
<output>75</output>

<result>75</result>