Two sisters make flowers, the elder sister makes 28 flowers, the younger sister makes 20 flowers, how many flowers the elder sister gives to the younger sister, the two have the same number of flowers?
姐妹两人做花，姐姐做了28朵，妹妹做了20朵，姐姐给妹妹几朵，两人的花就一样多了？
<gadget id="calculator">28 - 20</gadget>
<output>8</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<result>4</result>