Uncle Li paid a total of 156 yuan for 3 kilograms of lychees and 4 kilograms of longan. It is known that the price of 5 kilograms of lychees is equal to the price of 2 kilograms of longan. How much is it per kilogram of lychees?
李叔叔买3千克荔枝和4千克桂圆共付了156元，已知5千克荔枝的价钱等于2千克桂圆的价钱，每千克荔枝多少元？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">3 + 10</gadget>
<output>13</output>

<gadget id="calculator">156 / 13</gadget>
<output>12</output>

<result>12</result>