The average weight of a certain number of students in a group is 72 kg. If 10 students having an... скачать в хорошем качестве

The average weight of a certain number of students in a group is 72 kg. If 10 students having an...

The average weight of a certain number of students in a group is 72 kg. If 10 students having an average weight of 78 kg leave and 4 students having an average weight of 80 kg join the group, the average weight of the students in the group decreases by 0.7 kg. The number of students initially in the group is :निश्चित संख्या वाले एक समूह के छात्रों का औसत वज़न 72 किलो ग्राम है | यदि 78 किलो ग्राम औसत वज़न वाले 10 छात्र चले जाते हैं और 80 किलोग्राम औसत वज़न वाले 4 छात्र आ जाते हैं, तो समूह में छात्रों का औसत वज़न 0.7 किलो ग्राम से कम हो जाता है | आरंभ में समूह में छात्रों की संख्या थी :
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