Mom bought 3 kg of red beans and 3 kg of mung beans in the supermarket. Each kilogram of red beans is 2 yuan more expensive than each kilogram of mung beans. If you buy 6 kg of mung beans instead, how much
妈妈在超市购买了3千克的红豆和3千克绿豆．每千克红豆比每千克绿豆贵2元．如果改为购买6千克绿豆，就会多少
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>