The twice of sum of the ages of a father and his son is 8times the age of the son. If the average age of the father and the son is 28 years, what is father's age? 

After a discount of 20% Asmita bought an item for Rs.9600. Asmita sold it to other person and earned a profit of 18% on the original price. At what price other person bought the item?

A mixture of 40 liters of milk and water contains 30% water. How much milk should be added to this mixture so that the new mixture contains 80% milk?

The diagonal of a rectangle is 17 cm long and its perimeter is 46 cm. Find the area of the rectangle.

The age of Shipra can be obtained by subtracting three times her age 3 years ago from the three times her age after 3 years. What will her age after 2 years?

A certain sum of money at a certain rate doubles itself in 9 years, then in how many years it will become the same sum will be 5 times of itself?

Three friends Naimish, Ranveer and Arjun together started a business by investing Rs.250, Rs. 400 and Rs. 300 respectively. After 4 months Naimish invested Rs. 150 more and after 6 months Ranveer withdraw Rs. 100. While after 8 months Arjun invested Rs. 200 more. At the end of the year, a profit of Rs. 1280 is obtained. Find the share of Ranveer?