The average age of four children in a family is 12 years. If the spacing between

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Question
The average age of four children in a family is 12 years. If the spacing between their ages is 4 years, the age of the youngest child is?
Options
A. 6 years
B. 7 years
C. 8 years
D. 9 years

Correct Answer

6 years

Explanation

Let the age of youngest child be y.
so from question y + (y + 4) + (y + 8) + (y + 12) = 4 x 12
? 4y + 24= 48
? y = 6 years

Average problems

Search Results

1.
The average age of four players is 18.5 years. If the age of the coach is also included, the average age increases by 20%. The age of the coach is?
Options
A. 28 years
B. 31 years
C. 34 years
D. 37 years

2.
The average weight of a class of 40 students is 40 kg. If the weight of the teacher be included , the average weight increases by 500 gm . The weight of the teacher is?
Options
A. 40.5 kg
B. 60 kg
C. 60.5 kg
D. 62 kg

3.
The average weight of 8 men is increased by 2kg when one of the men whose weight is 50 kg is replaced by a new man . The weight of the new man is?
Options
A. 52 kg
B. 58 kg
C. 66 kg
D. 68 kg

4.
The average salary per head of all the workers in a workshop is Rs. 850, if the average salary per head of 7 technician is Rs. 1000 and the average salary per head of the rest is Rs 780, the total number of workers in the work- shop is?
Options
A. 18
B. 20
C. 22
D. 24

5.
The average earning of a mechanic for the first-four days of a week is Rs. 18 and for the last four days is Rs. 22. If he earns Rs . 20 on the fourth day, his average earning for the whole week is?
Options
A. Rs . 18.95
B. Rs 16
C. Rs. 20
D. Rs. 25.71

6.
In a T.V. factory, an average of 60 TVs are produced per day for the fist 25 days of the months. A few workers fell ill for the next five days reducing the daily average for the month to 58 sets per day . The average production per day for day last 5 days is?
Options
A. 45
B. 48
C. 52
D. 58

7.
The average of marks obtained by 120 candidates was 35. If the average of marks of passed candidates was 39 and that of failed candidates was 39 and that of failed candidates was 15, the number of candidates who passed the examination is?
Options
A. 100
B. 110
C. 120
D. 150

8.
The average age of 30 students in a class is 12 years. The average age of a group of 5 of the students is 10 years and that of another group of 5 them is 14 years. The average age of the remaining students is?
Options
A. 8 years
B. 10 years
C. 12 years
D. 14 years

9.
A shopkeeper earned Rs. 504 in 12 days. His average income for the first four days was Rs. 40 a day. His average income for the remaining days is?
Options
A. Rs. 40
B. Rs. 42
C. Rs. 43
D. Rs. 45

10.
The average weight of three men A, B and C is 84 kg. Another man D joins the group and the new average becomes 80 kg if another man E, whose weight is 3kg more than that of D, replace A, then the average weight of B , C, D and E becomes 79 kg. the weight of A is?
Options
A. 70 kg
B. 72 kg
C. 75 kg
D. 80 kg

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