A lamb and its mother weigh 50 kilograms together. It is known that the weight of the lamb is 12 kilograms. How much is the weight of the mother sheep?
一只小羊和羊妈妈共重50千克，已知小羊重量是12千克，羊妈妈体重是多少千克？
<gadget id="calculator">50 - 12</gadget>
<output>38</output>

<result>38</result>