A piece of grass grows the same amount every day, 10 cows can eat it for 22 days, 16 cows can eat it for 10 days, how many days can 27 cows eat it.
一块草地，每天长草的数量相同，10头牛能吃22天，16头牛能吃10天，问27头牛能吃多少天．
<gadget id="calculator">16 * 10</gadget>
<output>160</output>

<gadget id="calculator">10 * 22</gadget>
<output>220</output>

<gadget id="calculator">220 - 160</gadget>
<output>60</output>

<gadget id="calculator">22 - 10</gadget>
<output>12</output>

<gadget id="calculator">60 / 12</gadget>
<output>5</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">160 - 50</gadget>
<output>110</output>

<gadget id="calculator">27 - 5</gadget>
<output>22</output>

<gadget id="calculator">110 / 22</gadget>
<output>5</output>

<result>5</result>