Xiao Zhang, Xiao Li, and Xiao Wang weighed their weight. Xiao Zhang and Xiao Li together weighed 90.8 kg, and Xiao Wang and Xiao Li weighed 88.5 kg. How many kilograms does Xiao Zhang weigh more than Xiao Wang?
小张，小李，小王三人称体重，小张和小李合称共重90.8千克，小王和小李合称共重88.5千克．求小张比小王重多少千克？
<gadget id="calculator">90.8 - 88.5</gadget>
<output>2.3</output>

<result>2.3</result>