# The average age of 24 boys and the teacher is 15 years. When the teacher’s age is excluded, the average decreases by 1. What is the age of the teacher?   Option 1)     Option 2)     Option 3)     Option 4)   Data inadequate   Option 5)

$Avg. \: Of (24 boys\: & \: 1 teacher ) =>25\: observations = 15$
$sum\: of \: 25 = 25*15=375$
$without \: teacher\: sum = 24*14= 336$
$Age \: of\: teacher= 375-336=39 years$