There are 3,600 black goldfish in the pond, which is 15 times more than the red goldfish. How many goldfish are there in the pond?
池塘里有黑金鱼3600条，是红金鱼的15倍，池塘里共有多少条金鱼？
<gadget id="calculator">3_600 / 15</gadget>
<output>240</output>

<gadget id="calculator">240 + 3_600</gadget>
<output>3_840</output>

<result>3_840</result>