Basketballs are 40 yuan each, and now the price is reduced by half. How many basketballs can you buy with the money you used to buy for 30 basketballs?
篮球每个40元，现在降价一半，原来买30个篮球的钱，现在可以买多少个．
<gadget id="calculator">40 * 30</gadget>
<output>1_200</output>

<gadget id="calculator">40 / 2</gadget>
<output>20</output>

<gadget id="calculator">1_200 / 20</gadget>
<output>60</output>

<result>60</result>