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A watershed is a natural geo-hydrological unit of land that collects water and drains it through a common point via a system of streams. The Amazon Basin is the largest watershed in the world. For comparison:
- A reservoir is a large lake where water is stored for use by a particular area or city
- An aquifer is an underground layer of porous or permeable rocks that store and retain groundwater
- Warabandi is a rotational water supply system based on predetermined schedules according to area and crop needs
A’s age is 150% of what he was 6 years ago, But 50% of what it will be after 6 years. What is his present age?
The ratio of the present age of 'I' to that of 'J' is 7:9. If eight years hence, the ratio of their ages will become 9:11, find the sum of their ages, e...
If the total ages of A and B is 6 years more than the total age of B and C. C is how many years younger than A?
The ratio of age of A and his son is 5:1. If the difference of their ages 6 years ago is 24, then find the sum of the ages of A and his son together 11 ...
Ratio of present ages of A and B is 6:5, respectively. C who is 6 years older than A will become 60 years older after 12 years. Find the present age of B.
In a group of 10 members, two individuals are 20 and 30 years old. Excluding these two, the average age of the remaining members increases by 1 year. De...
Present ages of 'X' and 'Y' are in ratio 7:8, respectively. If twelve years hence from now, age of 'X' will be 15% less than that of 'Y', then find the ...
If R’s age is twice the average age of P, Q and R. P’s age is one third the average age of P, Q and R. If Q is 10 years old, the average age...
'P' and 'Q' have present ages in the ratio of 4:5. If Q’s current age is increased by 20%, the gap between their ages becomes 1...
