There are 25 boys and 25 girls in Class 51 of Xinhua Road Primary School. If one of them is chosen to sing, what is the probability of choosing a girl?
新华路小学五1班有男生25人，女生25人，从中任选一人唱歌，则选到女生的可能性是多少．
<gadget id="calculator">25 + 25</gadget>
<output>50</output>

<gadget id="calculator">25 / 50</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>