There are 6 baskets with the same number of apples. If 30 apples are taken from each basket, the sum of the remaining apples is equal to the sum of the apples in the original 4 baskets. How many apples are there in each basket?
在6个筐里放着同样多的苹果．如果从每个筐里拿出30个苹果，那么剩下苹果的总和等于原来4个筐的苹果的和．原来每个筐里有多少个苹果．
<gadget id="calculator">6 - 4</gadget>
<output>2</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">30 * 3</gadget>
<output>90</output>

<result>90</result>