There were originally 40 members in the red scarf chorus, of which boys accounted for 25%. Later, 10 boys were added. At this time, how many boys accounted for the total number?
红领巾合唱队原来有40人，其中男生占25%，后来又增加10名男生，这时男生占总人数的多少．
<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">40 * (1/4)</gadget>
<output>10</output>

<gadget id="calculator">10 + 10</gadget>
<output>20</output>

<gadget id="calculator">40 + 10</gadget>
<output>50</output>

<gadget id="calculator">20 / 50</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>