Question
What is the approximate percentage, by weight, of oxygen
in the earth's crust?Solution
45%-50% of the earth's crust is made up of oxygen in the formed of oxides, carbonates and other compounds. Oxygen plays a very important role in the existence of life on earth.
The present age ratio of X and Y is 4:5. Also, the ratio of X’s age 7 years ago and Y’s age 6 years later is 1:2. Find their total current age.
Twelve years hence, the ratio between the ages of C and E is 5:7 respectively. The present age of A is 25% less than that of D. Four years ago, the aver...
‘A’ is 8 years younger than ‘B’ and 7 years elder than ‘C’. If the present age of ‘B’ and ‘D’ is 20 years and 15 years, respectively...
Five years ago, the ratio of the ages of A and B was 2:3. After 5 years, the ratio of their ages will be 4:5. What are their present ages?
Present age of ‘A’ is 50% more than that of ‘B’. If 20 years hence from now, ‘B’ will be 16 years younger than ‘A’, then find the sum of...
Present age of ‘C’ is 20% more than that of ‘D’. 3 years ago, ‘C’ was 1.4 times as old as ‘D’. Find the present age of ‘D’.
...The current age ratio of Akash to karan is 7:9, and the current age ratio of karan to Chetna is 3:5. If the average of their present ages is 62 years, d...
Rishav's current age is 25% more than Sourav's current age. In 8 years, the ratio of their ages will be 5:6. What will be Rishav's age 10 years from now?
12 years ago from now, ratio of ages of ‘R’ and ‘L’ was 3:5, respectively. If ‘L’ is 8 years elder to ‘R’, then what will be the age of ...
Neha was married 5 years ago. In his present age 8/7 times of his age at the time of her marriage. Her son’s age is 1/8 times of her present age, ...
