The main components of honey are fructose and glucose, which account for more than (3/5) of the total mass of honey. There is a kind of honey, the mass of fructose and glucose accounts for (4/5) of the total mass of honey. If there are 2.5kg of this honey, how many kilograms of fructose and glucose are there in total?
蜂蜜最主要的成分是果糖和葡萄糖，果糖和葡萄糖的质量占蜂蜜总质量的(3/5)以上．有一种蜂蜜，果糖和葡萄糖的质量占蜂蜜总质量的(4/5)．如果有2.5kg的这种蜂蜜，其中的果糖和葡萄糖共有多少千克？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">2.5 * (4/5)</gadget>
<output>2</output>

<result>2</result>