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2. The mean age of 20 children of a class is12. A 10 year old child left the class and anew chil took admission. What is the age ofthe new child in years? |
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Answer» 33 years is the correct answer 20 children avg age = 1220children total age = 12×20= 240 20-1=19student total age = 240-10= 230year19 student total age = 23019 student avg age = 230/19= 12.105 years appox average of 20 students=12 years, total age of 20 students= 20 x 12 = 240 years. total age 20 students and teachers = 13 x 21=26+13=273 years, age of teachers = 273-240=33 years 33 is correct answer |
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