Related Questions

One-fifth of the batteries produced by an upstart factory are defective and one -quarter of all batteries produced are rejected by the quality control technician. If one-tenth of the non-defective batteries are rejected by mistake and if all the batteries not rejected are sold, then what percent of the batteries sold by the factory are defective?
A 4%
B 3%
C 6%
D 5%
The average age of A, B And C sis 30 years. If the difference between B's age and A's age is same as the difference between C's age and B's age . If D is 40 years older than B then what is the sum of the age B and D?
A 130 years
B 60 years
C 75 years
D 100 years
8 years ago, the ratio of A's age to B's age was 4 :5 At present the ratio of B's age and C's age is 4 : 5 At present , the difference between A's age and C's age is 20 years, then what is the sum of the ages of A, B and C?
A 138 years
B 164 years
C 148 years
D 152 years
Father's age is four times of his son's age now. Twenty years from now, father's age will be double his son's age. What will be the son's age ten years from now?
A 15
B 20
C 25
D 30
A man's age is now 3 times his son's age. Eight years back, the man's age was 5 times his son's age. what is the present age of the son?
A 15
B 16
C 20
D 18
The present age of son is half of the present age of his mother. Ten years ago, his mother's age was thrice the age of her son . What is the present age of the son?
A 25 years
B 20 years
C 30 years
D 40 years
A father's age is four times his son's age now. Twenty years from now, the father's age will be double his son's age. What will be the son's age ten years from now?
A 10
B 15
C 20
D 30
The present age of son is half of the present age of his mother. Ten years ago, his mother's age was thrice the age of her son. What is the present age of the son ?
A 20 years
B 25 years
C 30 years
D 40 years
Ravi's brother is 3 years senior to him. His father was 28 years of age when his sister was born while his mother was 26 years of age when he was born. If his sister was 4 years of age when his brother was born, what were the ages of Ravi's father and mother respectively when his brother was born ?
A 32 years, 23 years
B 32 years, 29 years
C 35 years, 29 years
D 35 years, 33 years
5 years ago the ration of father's age to son's age was 5:1 and 2 years later father's age will be 3 times his sons's age. What is ration of their present age?
A 5:6
B 7:3
C 10:3
D 11:7

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