Avg age of X number of adults in a class is 30yrs. If 12 new adults with avg age of 32 joined with them then the avg age increases by one. Find X?
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Step-by-step explanation:
Total age of X adults = 30x
total age of 12 new adults = 32*12= 384
Total age of x+12 persons = (x+12)*31 = 30x+384
hence
31x+372 = 30x+384
x= 12
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