Syntel
Company
Numerical Ability
Age Problem
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?
Read Solution (Total 3)
-
- 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 - 13 years agoHelpfull: Yes(30) No(3)
- Starting X members
total members=X+12
Avg of X+12 members=>(X.30+12.32)/(X+12)=31
X=12 - 13 years agoHelpfull: Yes(15) No(2)
- initial sum=30*x
then final eq. (32*12+30*x)/(12+x)=31
so x=12 - 13 years agoHelpfull: Yes(4) No(2)
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