3 cows and 6 sheep eat a total of 93 kg of grass a day, and 6 cows and 5 sheep eat a total of 130 kg of grass a day. On average, how many kilograms more does each cow eat than each sheep per day?
3头牛和6只羊一天共吃草93千克，6头牛和5只羊一天共吃草130千克．每头牛平均每天比每只羊平均每天多吃多少千克．
<gadget id="calculator">93 * 2</gadget>
<output>186</output>

<gadget id="calculator">186 - 130</gadget>
<output>56</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">12 - 5</gadget>
<output>7</output>

<gadget id="calculator">56 / 7</gadget>
<output>8</output>

<gadget id="calculator">8 * 6</gadget>
<output>48</output>

<gadget id="calculator">93 - 48</gadget>
<output>45</output>

<gadget id="calculator">45 / 3</gadget>
<output>15</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<result>7</result>