Two baskets of apples, A and B, have the same mass. If 10 kilograms of apples are taken from basket A and put into basket B, then the mass of apples in basket B is three times that of basket A. How many kilograms of apples are there in basket A?
甲乙两筐质量相同的苹果，如果从甲筐中拿走10千克苹果放入乙筐，那么乙筐苹果的质量就是甲筐的3倍，甲筐中现在有苹果多少千克？
<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">10 * 1</gadget>
<output>10</output>

<result>10</result>