A string of beads can be divided into N groups, and each group of beads is composed of 2 red, 3 black, and 5 white beads. How many of these beads are red beads?
有一串珠子可分成N组，每组珠子都是按2红、3黑、5白的顺序组成．这些珠子中红珠占多少．
<gadget id="calculator">2 + 3 + 5</gadget>
<output>10</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>