Bank Exam Government Jobs Exams Numerical Ability Averages

The avg age of 24 men is decreased by 2 when one of the age is 60 is replaced by new one find the new one age....?

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Ans=12 years

If average of 24 men=x and age of new man =y, then (24x -60 +y)/24= x-2, y=12
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300 298 307 279 344 ?
solve number series A good train and a passenger train are running on the parallel tracks in the same direction.the driver of the goods train observe that the passanger train coming from behind, overtakes and crosses his train completely in 1 min whereas a passanger on the passanger train marks that he crosses the goods train in 2/3 minutes. the ratio of their length is?

4:1
3:1
1:2
none of these