There are two kinds of camels, the dromedary camel with only one hump on its back and the double-humped camel with two humps on its back. The dromedary camel is taller and has longer limbs, which can walk and run in the desert; the double-humped camel has short and stubby limbs. , Suitable for walking in the desert and snow. There is a group of camels with 23 humps and 60 feet. How many of these camels are there?
骆驼有两种，背上只有一个驼峰的单峰骆驼和背上有两个驼峰的双峰骆驼，单峰骆驼比较高大，四肢较长，在沙漠中可走可跑；双峰骆驼四肢短粗，适合在沙漠和雪地中行走．有一群骆驼有23个驼峰，60只脚，这些骆驼有多少只．
<gadget id="calculator">60 / 4</gadget>
<output>15</output>

<result>15</result>