One third of a certain journey is covered at the speed of 40 km/hr, one fourth at the speed of 25 km/hr and the rest at the speed of 50 km/hr. what will be the average speed(in km/hr) for the whole journey?

Population of a town increases by 12% every year. If the population of town will be 188160 after 2 years, then what is its present population?

The angle of elevation of a tower from a distance 50 m from its foot is 30°. The height of the tower is 

Three partners invested Rs. 42000, Rs. 48000 and Rs. 32000 respectively. partnership condition is that, each will the get interest on his capital at the rate of 7 % p. a. and the remaining profit will be divided in the ratio of their capitals. If at the end of the year the total profit is Rs. 32940, then find the share of A in profit. 

An article is sold at 5 % profit. The ratio of selling price and cost price will be 

The average of nine consecutive odd numbers is 53. The least odd number is: 

Study the following pie-diagrams carefully and answer the question given below it.
PERCENTAGE COMPOSITION OF HUMAN BODY 

 In the human body, what part is made of neither bones nor skin?

Study the following pie-diagrams carefully and answer the question given below it.
PERCENTAGE COMPOSITION OF HUMAN BODY 

what will be the quantity of water in the body of a person weighing 50 kg?