self Maths Puzzle

The average weight of the teacher and six students is 12 kg which is reduced by 5 kg if the weight of the teacher is excluded. How much does the teacher weigh ?

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self Other Question

The average of ages of 10 persons in a club was 32. What should be the age of the new person joining in the club so as to increase the average by 4 ? A batsman had a certain average of runs for 16 innings. In the 17th innings, he made a score of 87 runs thereby increasing his average by 3. What is his average after 17 innings?