self Maths Puzzle Numerical Ability Averages

The average age of father and his two sons is 27 years. The difference in age between the two sons is 4 years and five years ago the average age of the two sons was 12 years. What is the present age of the father?
(a)34years(b)47years(c)64years(d)27years

Read Solution (Total 2)

47 years

The average age of father and his two sons is 27 years.
The total age of father and his two sons is 81 years.
five years ago the average age of the two sons was 12 years.
Now the average age of the two sons is 17 years.
Now the total age of the two sons is 34 years.
age of father = 81-34 =47 years
14 years agoHelpfull: Yes(3) No(0)

anwer : (b)47years
total age of sons and father = 27*3 = 81
now the total age of sons = 34
so the father present age = 81-34 = 47
13 years agoHelpfull: Yes(1) No(0)

self Other Question

The average marks of 14 students was calculated as 71. But, it was discovered later that the marks of one student was taken as 42 instead of 56 and the marks of another student was wrongly taken as 74 while it was actually 32. If these corrections are now made then what is the average of the 14 students?
(a)67(b)68(c)69(d)71
The average weight of three men A, B and C is 84 Kg. The average weight becomes 80 Kg when D joins them. If E whose weight is 3 Kg more than D joins the group replacing A, then the average weight of B, C, D and E becomes 79 Kg. The weight of A is:
(a)65kg (b)70kg (c)75kg (d)80kg