Xiaohong weighs 42kg, Xiaoyun weighs 40kg, and Xiaoxin's weight is equivalent to (1/2) the sum of the weights of Xiaohong and Xiaoyun. How many kilograms does Xiaoxin weigh?
小红体重42千克，小云体重40千克，小新的体重相当于小红和小云体重总和的(1/2)．小新体重多少千克？
<gadget id="calculator">42 + 40</gadget>
<output>82</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">82 * (1/2)</gadget>
<output>41</output>

<result>41</result>