There are 40 boys in an art class, and 5% more girls than boys. How many girls are there?
美术班有男生40人，女生比男生多5%，女生有多少人．
<gadget id="calculator">5 / 100</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">1 + (1/20)</gadget>
<output>21/20 = around 1.05</output>

<gadget id="calculator">40 * (21/20)</gadget>
<output>42</output>

<result>42</result>