Xiao Ling weighs 30 kg, and Xiao Ling weighs less than Xiao Hong (1/7). How many kilograms does Xiaohong weigh?
小玲重30千克，小玲的体重比小红轻(1/7)．小红的体重是多少千克？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

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

<result>35</result>