Average height of a class of 12 students is 180 cm. The average decreases to 179 cm when the height of the class teacher is also added. What is the height of the teacher?
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ave height of 12 students=180cm
total height of 12students=180×2=2160cm
ave height of 12students+one teacher=179cm
total height of 13members (12+1)=179×13=2327cm
height of teacher=sum of height of 13members-total height of12students=167cm
total height of 12students=180×2=2160cm
ave height of 12students+one teacher=179cm
total height of 13members (12+1)=179×13=2327cm
height of teacher=sum of height of 13members-total height of12students=167cm
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