Zhang Ming's weight is 30 kg, Li Dong's weight is Zhang Ming's (5/6), and Li Dong's weight is Wang Hui's (5/7). How many kilograms does Wang Hui weigh?
张明体重30千克，李东的体重是张明的(5/6)，李东的体重是王辉的(5/7)．王辉体重多少千克？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(5/6) / (5/7)</gadget>
<output>7/6 = around 1.166667</output>

<gadget id="calculator">30 * (7/6)</gadget>
<output>35</output>

<result>35</result>