1.

thr average age of twenty students is 12 years.If the teacher's age is included,the average increases by one.what is the age of the teacher?​

Answer»

Step-by-step explanation:

SUM of AGES of 20 students=20×12=240

now including teacher total people=21

according to given CONDITION,

NEW average=13

so sum of ages of total people=21×13=273

age of teacher=273-240=33



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