30 students from 5 classes solved 40 math problems. Each student must answer at least one question. Every two students in the same class solved the same number of questions. The number of questions answered by any two students in different classes is also different. Question: What's maximum possible number of students who only answered one question?
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Wanafunzi 30 kutoka madarasa 5 wanatatua matatizo 40 ya hesabu. Kila mwanafunzi lazima ajibu angalau swali moja. Kila wanafunzi wawili katika darasa moja walitatua idadi sawa ya maswali. Idadi ya maswali yaliyojibiwa na wanafunzi wawili wowote kutoka madarasa tofauti pia ni tofauti. Swali: Ni wanafunzi wangapi wengi iwezekanavyo walijibu swali moja tu

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Wanafunzi 30 kutoka madarasa 5 kutatua matatizo 40 ya hisabati. Kila mwanafunzi lazima kujibu angalau swali moja. Kila wanafunzi wawili katika darasa moja kutatua idadi sawa ya maswali. idadi ya maswali alijibu na yoyote wanafunzi wawili katika madarasa tofauti ni tofauti pia. Swali: ni idadi gani ya wanafunzi iwezekanavyo ambayo alijibu swali moja tu?