2&3=2+3+4=9, 5&4=5+6+7+8=26. According to this rule, 5&5=how much.
2&3=2+3+4=9，5&4=5+6+7+8=26．按此规律，5&5=多少．
<gadget id="calculator">5 + 6 + 7 + 8 + 9 + 10</gadget>
<output>45</output>

<result>45</result>