[(169×121)÷(11×13)]-3=?

A trade buys 800 kgs of tomatoes for Rs 7200.  10% tomatoes are damaged in transportation. At what rate (Rs / kg) should he sell the rest earn 30 % profit? 

The average mathematics marks of two section A and B of class IX in the annual examination is 74. The average marks of Section A is 77.5 and that of Section B is 70. The ratio of number of student of section A and B is:

Study the given graph and answer the question that follows.

What is the ratio of the total expenditure in 2015 and 2016 to the total revenue of the company in 2016 and 2018?

A fraction becomes $${1\over 6}$$ when 4 is subtracted from its numerator and 1 is added to its denominator. If 2 and 1 are respectively added to its numerator and the denominator, it becomes $${1\over 3}$$. Then, the LCM of the numerator and denominator of the fraction, must be 

A wall of 100 metres can be built by 7 men or 10 women in 10 days. How many days will 14 men and 20 women take to build a wall of 600 metres 

On a certain principal if the simple interest for two years is Rs. 1400 and compound interest for the two years is Rs. 1449, what is the rate of interest?