Problems on ages Quiz 1

The average age of student in section A of 40 students is 10 years and the average age of students in section B of 30 students is 12 years. Find the average age of students in both section taken together?




2) The average age of 30 boys of a class is equal to 14 years. When the age of the class teacher is included the average becomes 15 years. Find the age of the class teacher.





3) The average age of A and B is 20 years. If C were oreplace A the average would be 19 and if C to replace B, the average would be 21. what are the age of A,B and C?





4) The average weight of 4 men is increased by 3 kg when one of them who weights 120 kg is replace B, te average would be 21. What are the age A,B and C?





5) The average age of 40 dstudents in a class is 15 years. Hen 10 new students are admiteed the average is increased by 0.2 years. Find the average age of the ne student?





6) The average age of 8 persons in a committee is increased by 2 years when two men aged 35 years and 45 years aer substituted by two women. Find the average age of these two women?





7) In a class , there ae 20 boys whose average age is decreased by 2 months when one by aged 18 years is replaced by a new boy. Find the age of the new boy?





8) The average age oof a family of 6 members is 22 years. If the age of the youngest member be 7 years then what ws the average age of the family at the birth of the youbgest member?





9) The average age of 10 members in a family is 21 years and due to the death of one family member, the average age is reduced by 2 months find the age of the member who died?





10) The average age of 4 sisters is 7 years. If the age of the mother is included the average is increased by 6 years. Find the age of the mother?







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