A calf bred by Yaaote Cow Farm weighed 30.5 kilograms at birth and 77.3 kilograms after 3 months. How many kilograms does it grow each month on average?
亚奥特牛场培育的一头小奶牛出生时重30.5千克，3个月后重77.3千克，平均每月增长多少千克？
<gadget id="calculator">77.3 - 30.5</gadget>
<output>46.8</output>

<gadget id="calculator">46.8 / 3</gadget>
<output>15.6</output>

<result>15.6</result>