In a pot of goldfish, red goldfishes account for 1/4 of the total, black goldfishes belong to red goldfishes (3/5), and the rest are 24 flower goldfishes. How many red goldfishes are there?
一盆金鱼，红金鱼占总数的(1/4)，黑金鱼是红金鱼的(3/5)，其余是24条花金鱼，红金鱼有多少条？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (1/4) - (3/20)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">24 / (3/5)</gadget>
<output>40</output>

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

<result>10</result>