P, Q and R gets a total wage of Rs.3600 if they work together. P and Q gets a total wage of Rs. 2800 if they work together and P alone gets Rs.1600. Find the efficiency ratio of P, Q and R  

The simple interest on an amount at the rate of 7 percent for five years is Rs 700. So how much is the principal?

A smaller circle touches a bigger circle internally and also passes through the center 'O' of the bigger circle. If the area of the smaller circle is 192 $${cm^2}$$, the area of the bigger circle (in $${cm^2}$$) is:

Wheat costing Rs. 30/kg, Rs. 35/kg and a third variety of wheat are mixed in the ratio of 3 ∶ 4 ∶ 2. If the mixture costs Rs. 34/kg, then what will be the cost (in Rs./kg) of the third variety of wheat?

Study  the given pie chart and answer the question that follows.
Break-up (degree-wise) of the number of students in five schools (A, B, C, D and E) in a city.
Total number of students =5200

If the ratio of the number of boys to that of girls in school B is 7:6 and the ratio of number of boys to that of girls in school D is 4 : 5, then what is the ratio of number of boys in B to that of girls in D?

Study the given graph and answer the question that follows.

The total number of students obtaining less than 50 marks is what percentage more than the total number of students obtaining 60 marks or more ( correct to one decimal place).

if a=26 and b=22, then the value of   $${{a^3-b^3}\over {a^2-b^2}}-{3ab\over a+b}$$ is

The ratio of the square of a number and the inverse of its cube is 243/16807. what is the number?