The number of basketballs in the school sports room is 40% more than that of footballs. How much does the number of footballs account for in the total of the two balls?
学校体育室里篮球个数比足球多40%，足球个数占两种球总数的多少
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 + (2/5) + 1</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">1 / (12/5)</gadget>
<output>5/12 = around 0.416667</output>

<result>5/12 = around 0.416667</result>