Average
- The average age of a husband and his wife was 23 years at the beginning of their marriage. After five years they have a one-year old child. The average age of the family of three, when the child was born, was
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Here , At the beginning of their marriage ,The average age of a husband and his wife = 23 years
After five years of marriage, age of ( Husband + wife + child ) = 46 + 10 + 1 = 57 years
At the time of birth of child, age of ( Husband + wife + child ) = 57 – 3 = 54 yearsCorrect Option: C
Here , At the beginning of their marriage ,The average age of a husband and his wife = 23 years
After five years of marriage, age of ( Husband + wife + child ) = 46 + 10 + 1 = 57 years
At the time of birth of child, age of ( Husband + wife + child ) = 57 – 3 = 54 years
∴ Required average age = 54 ÷ 3 = 18years
- 5 years ago, the average age of P and Q was 15 years. Average age of P, Q and R today is 20 years. How old will R be after 10 years?
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According to question ,
Present age of (P + Q) = 30 + 10 = 40 years
(P + Q + R)’s present age = 20 × 3 = 60 years
R’s present age = 60 – 40 = 20 yearsCorrect Option: C
According to question ,
Present age of (P + Q) = 30 + 10 = 40 years
(P + Q + R)’s present age = 20 × 3 = 60 years
R’s present age = 60 – 40 = 20 years
∴ R’s age after 10 years = 20 + 10 = 30 years
- The average age of a family of 10 members is 20 years. If the age of the youngest member of the family is 10 years, then the average age of the members of the family just before the birth of the youngest member was approximately
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Here ,The average age of a family of 10 members = 20 years.
Sum of the present age of 10 members = 20 × 10 = 200 years
Total age of 9 members, 10 years ago = 100 years∴ Required average = 100 9
Correct Option: D
Here ,The average age of a family of 10 members = 20 years.
Sum of the present age of 10 members = 20 × 10 = 200 years
Total age of 9 members, 10 years ago = 100 years∴ Required average = 100 9 11 1 year 9
- Average age of 8 men is increased by 3 years when two of them whose age are 30 and 34 years are replaced by 2 persons. What is the average age of the 2 persons ?
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Here , Average age of 8 men increased by = 3 years
When two of them whose age are 30 and 34 years are replaced by 2 persons
Sum of the age of two new persons = 30 + 34 + 3 × 8 = 88 yearsCorrect Option: C
Here , Average age of 8 men increased by = 3 years
When two of them whose age are 30 and 34 years are replaced by 2 persons
Sum of the age of two new persons = 30 + 34 + 3 × 8 = 88 years
∴ Required average = 88 ÷ 2 = 44 years
- The average age of 11 players of a cricket team is increased by 2 months when two of them aged 18 years and 20 years are replaced by two new players. The average age of the new players is
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On the basis of given details in question ,
Total increase = 11 × 2 = 22 months
∴ Sum of the age of both cricketers = (18 + 20) years 22 months
Sum of the age of both cricketers = 38 years 22 monthsCorrect Option: C
On the basis of given details in question ,
Total increase = 11 × 2 = 22 months
∴ Sum of the age of both cricketers = (18 + 20) years 22 months
Sum of the age of both cricketers = 38 years 22 months∴ Average age = 38 years 22 months = 19 years 11 months 2
