Yangcun has stored some grass, among which the green grass is three times more than the yellow grass by 2 kg. Eat 15 kg of green grass and 6 kg of yellow grass every day; after eating for a few days, there are still 74 kg of green grass and 4 kg of yellow grass. How many kilograms of green grass and yellow grass are there in Yangcun?
羊村储备了一些草，其中青草是黄草的3倍多2千克．每天吃15千克青草，6千克黄草；吃了若干天后，青草还剩下74千克，黄草剩下4千克．羊村的青草和黄草共多少千克？
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<gadget id="calculator">74 - 12 - 2</gadget>
<output>60</output>

<gadget id="calculator">6 * 3</gadget>
<output>18</output>

<gadget id="calculator">18 - 15</gadget>
<output>3</output>

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

<gadget id="calculator">15 * 20</gadget>
<output>300</output>

<gadget id="calculator">6 * 20</gadget>
<output>120</output>

<gadget id="calculator">300 + 74 + 120 + 4</gadget>
<output>498</output>

<result>498</result>