The weight ratio of Xiao Liu and Xiao Li is 2:3, and Xiao Li weighs 30 kilograms, so how many kilograms does Xiao Liu weigh?
小刘和小李的体重比是2：3，小李重30千克，则小刘重多少千克．
<gadget id="calculator">2 * 30</gadget>
<output>60</output>

<gadget id="calculator">60 / 3</gadget>
<output>20</output>

<result>20</result>