Electric bulbs are filled with :
Filling a bulb with an inert gas such as argon or nitrogen slows down the evaporation of the tungsten filament compared to operating it in a vacuum.
The ratio of age of A and his son is 9:2. If the difference of their ages 7 year ago is 21, then find the sum of ages of A and his son 13 year hence?
The ratio of age of ‘B’ after 7 years from now and age of ‘C’ 6 years ago from now is 7:4, respectively. The present age of ‘C’ is 30% of th...
If the sum of the ages of a father and his son is 60 years and the difference of their ages is 30 years, what is the father's age?
The average of the present ages of A, B, C and D is (y-3) years. 12 years hence, the ratio between the ages of A and C is 9:8 respectively. Th...
8 years ago, the average age of a family of six persons was 50 years. In between these 8 years the family adopted a girl. Now at present the average age...
The ratio of difference between the present age of A and B to the present age of B and C is 6:1. 6 years hence, the ratio between the age of A and C is ...
The ratio of the present ages of father and his son is 7:5. The product of their ages 3 years ago was 32 times of his son’s age that year. What was so...
A is 4 years older than B while C is 5 years younger than B. The ratio of age of A, 7 years hence and age of B, 6 years ago is 3:2. What was age of C, 1...
Amit age after 13 years will be 3 times his age 5 years back. What is the present age of Amit?
The average age of the husband, wife and their child 4 years ago was 24 years and that of the husband and the child 5 years ago was 19 years. The prese...
