-20 लड़कों की एक कक्षा में औसत आयु 12 वर्ष है ।
तदनुसार, यदि उस कक्षा में 5 ऐसे नए लड़के शामिल हो
जाएँ, जिनकी औसत आयु 7 वर्ष हो, तो कक्षा की
औसत आयु कितनी हो जाएगी ?
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Answer:
answer - 11 yrs
total age of 20 students = 20×12=240
.
total age of 5 new students = 5×7= 35
.
total age of all students = 240+35 = 275
.
avg of all 25 student = 275÷25 = 11 yrs (ans)
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