6 kg of radish for 2 kg of tomato, 9 kg of tomato for 3 kg of shiitake mushroom. How many kilograms of carrots are exchanged for 4 kilograms of shiitake mushrooms?
6千克萝卜换2千克番茄，9千克番茄换3千克香菇．4千克香菇换多少千克萝卜．
<gadget id="calculator">9 * 4</gadget>
<output>36</output>

<result>36</result>