The weight of the watermelon is 1(2/3) times the weight of the pumpkin, then the weight of the pumpkin is the sum of the watermelon and the pumpkin.
西瓜的重量是南瓜重量的1(2/3)倍，那么南瓜的重量是西瓜和南瓜的总量的多少．
<gadget id="calculator">5 + 3</gadget>
<output>8</output>

<gadget id="calculator">3 / 8</gadget>
<output>3/8 = around 0.375</output>

<result>3/8 = around 0.375</result>