The average of six numbers is 3.95. If the average of two of them is 3.4 while that of the other two is 3.85, what is the average of the remaining two numbers?

Chaitanya and Aditya started a business in partnership by investing Rs. 12,000 and Rs. 15,000 respectively. If, at the end of one year, Chaitanya's share in the profit was Rs. 1200, what is the amount of the overall profit?

If 200% of a number is 800, what will be 0.5% of that number?

The ratio of the ages of 'A' and 'B' ten years ago was 3 : 5. If the ratio of their present ages is 2 : 3, how old is 'B' today?

Out of 100 students, 50 failed in English and 30 failed in Maths. If 12 students failed in both English and Maths, how many passed in both the subjects?

What is the cost price of the article if when it is sold for Rs. 168, a loss of 16% is incurred?

How much water should be added to 30 litre solution of water and alcohol containing 90% alcohol so as to reduce the content of alcohol to 80%?

A boat goes downstream through certain distance in 1 hour and returns back in 1.5 hours. If the current is flowing at the speed of 3 km/hr, what is the speed of the boat in still water?

Two successive discounts of 30% followed by 25% are equivalent to a single discount of which of the following?