A cow produces an average of 15 kg of milk per day. How many kilograms of milk can 5 cows produce in 12 days?
1头奶牛平均1天产奶15千克．5头奶牛12天共产奶多少千克．
<gadget id="calculator">15 * 5 * 12</gadget>
<output>900</output>

<result>900</result>