There are 45 kilograms of apples in the fruit shop, and it is sold on the first day (4/9), how many kilograms of apples are sold on the first day?
水果店有45千克苹果，第一天卖出它的(4/9)，第一天卖出苹果多少千克？
<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">45 * (4/9)</gadget>
<output>20</output>

<result>20</result>