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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?
Dear Hemant
Sum of age of X adults=30X
sum of age of 12 new adults=12x32=384
new avg=384+30X/X+12 = 31
solve for X
X=12
All the best.
AKASH GOYAL
AskiitiansExpert-IIT Delhi
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