There are some big rabbits and small rabbits in the rabbit farm, and the number of small rabbits is 4 times that of big rabbits. After a while, some. The little rabbit grew into a big rabbit. As a result, 60 little rabbits grew into big rabbits, and there were as many big rabbits as little rabbits. So how many big rabbits are there in total?
养兔场有一些大兔子和小兔子，小兔子的数量是大兔子的4倍．过了一段时间后，一些．小兔子长成了大兔子．结果有60只小兔子长成了大兔子，且这时大兔子与小兔子一样多．那么原来共有大兔子多少只．
<gadget id="calculator">4 - 1</gadget>
<output>3</output>

<gadget id="calculator">3 / 2</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">60 / (3/2)</gadget>
<output>40</output>

<result>40</result>