There are 7 baskets of apples of equal weight in a fruit shop. If 20 kilograms are taken from each basket, the remaining apples in the 7 baskets are exactly equal to the apples in the original 3 baskets. How many kilograms does each basket of apples weigh?
水果店有7筐等重的苹果，如果从每个筐里取出20千克，7个筐里剩下的苹果正好等于原来3筐的苹果．原来每筐苹果重多少千克？
<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">7 / 4</gadget>
<output>7/4 = around 1.75</output>

<gadget id="calculator">20 * (7/4)</gadget>
<output>35</output>

<result>35</result>