The two sisters make flowers, the elder sister makes 30 flowers, and the younger sister makes 22 flowers. As many flowers as the elder sister gives to the younger sister, both of them have the same number of flowers.
姐妹两人做花，姐姐做了30朵，妹妹做了22朵，姐姐给妹妹多少朵，两人的花就一样多．
<gadget id="calculator">30 - 22</gadget>
<output>8</output>

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

<result>4</result>