The footballs are 135 yuan each, and the price is now reduced by half. How many footballs can you buy for the original price of 40 footballs?
足球每个135元，现降价一半，原来买40个足球的钱，现在可以买多少个．
<gadget id="calculator">135 / 2</gadget>
<output>135/2 = around 67.5</output>

<gadget id="calculator">40 / (135/2)</gadget>
<output>16/27 = around 0.592593</output>

<gadget id="calculator">135 * (16/27)</gadget>
<output>80</output>

<result>80</result>