4 cows and 9 sheep eat a total of 63 kilograms of grass a day, and 11 cows and 26 sheep eat a total of 177 kilograms of grass a day. How much grass does a cow and a sheep eat in total?
4头牛和9只羊一天共吃青草63千克，11头牛和26只羊一天吃青草177千克，那么一头牛和一只羊共吃多少千克的草？
<gadget id="calculator">177 * 4</gadget>
<output>708</output>

<gadget id="calculator">63 * 11</gadget>
<output>693</output>

<gadget id="calculator">708 - 693</gadget>
<output>15</output>

<gadget id="calculator">26 * 4</gadget>
<output>104</output>

<gadget id="calculator">9 * 11</gadget>
<output>99</output>

<gadget id="calculator">104 - 99</gadget>
<output>5</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">3 * 9</gadget>
<output>27</output>

<gadget id="calculator">63 - 27</gadget>
<output>36</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">3 + 9</gadget>
<output>12</output>

<result>12</result>