What is the simple interest when Rs. 13000 get the interest Rs. 6,370 in the $$ {3{1\over 2}}$$ year?

Sanjana invested Rs. 15000 in SI at the rate of 2x% per annum for two years and the same amount is invested in CI at the same rate of interest if she received Rs.150 more interest than S.I, then find the rate of interest per annum?

A scientific calculator is available at universal shoppe in hazratganj at 20 % discount and the same is available at only 15 % discount of universal shoppe Bhootnath market. Mr. Agrawal has just sufficient amount of 800 to purchase it at universal shoppe hazratganz. What is the amount that Mr. Agrawal has less than the required to purchase it at universal. shoppe Bhootnath ? 

There are 100 students in 3 sections A, B and C of a class. The average marks of all the 3 sections was 84. The average of B and C was 87.5 and the average marks of A is 70. The number of students in A was. 

The median of the following data will be _________. 

32, 25,33,27, 35, 29 and 30 

A mother is 28 years older than twice the age of her son. Five years later, the mother will be 10 years older than thrice the age of her son. What is mother’s present age?

If p men working p hours per day for p days produce p units of work, then the units of work produced by n men working n hours a day for n days is 

The Garibrath express can move at 45 km./hr. without its rake and the speed is diminished by a constant that varies as the square root of the number of wagons attached. If it is known that with 9 wagons, the speed is 30 km./hr., what is the greatest number of wagons with which the train can just move?