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在一次狗展上,狮子狗的数量至少是猎兔犬数量的1/5,至多是牧羊犬数量的1/6;而且狮子狗和猎兔犬的数量至少有23只.请问在这次狗展上的牧羊犬至少有多少只?
At a dog show, the number of poodles at least one fifth of the number of beagle dogs, up to one-sixth of the number of shepherds; and the number of poodles and harriers at least 23. In this dog show Sheepdog at least how many?