Xiao Ming has 48 shells, and Xiao Hong has 30 shells. How many shells does Xiao Ming give to Xiao Hong?
小明有48个贝壳，小红有30个贝壳，小明给小红多少个两人贝壳同样多？
<gadget id="calculator">48 - 30</gadget>
<output>18</output>

<gadget id="calculator">18 / 2</gadget>
<output>9</output>

<result>9</result>