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The average age of 22 students of a class is 47 years. If the age of the teacher is also included, the average age of the whole group becomes 48 years. The age (in years) of the teacher is:

There are 13 members in group $A$, 10 members in group B and 45 members in group C . All the members of these groups went to a restaurant. The average amount spent on each member of group A, B and C is ₹367, ₹112 and ₹401, respectively. The total average amount (in ₹) spent per member is: