Xiaogang paid a total of 33 yuan for 3 kilograms of pears and 3 kilograms of apples, and Xiaoqiang paid a total of 45.4 yuan for 3 kilograms of pears and 5 kilograms of apples. How many kilograms per kilogram of pears?
小刚买3千克梨和3千克苹果共付了33元，小强买了3千克梨和5千克苹果共付了45.4元，每千克梨多少千克？
<gadget id="calculator">20.4 / 3</gadget>
<output>6.8</output>

<result>6.8</result>