Mathematics
At an annual function of a school, each student gives gift to every other student. If the number of gifts is 1980, find the number of students.
Related Questions
The speed of an express train is x km/h and the speed of an ordinary train is 12 km /h less than that of the express train. If the ordinary train takes one hour longer than the express train to cover a distance of 240 km , find the speed of the express train.
In a P.T. display, 480 students are arranged in rows and columns. If there are 4 more students in each row than the number of rows, find the number of students in each row.
In an auditorium , the number of rows was equal to number of seats in each row. If the number of rows is doubled and the number of seats in each row is reduced by 5, then the total number of seats is increased by 375. How many rows were there ?
A bus covers a distance of 240 km at a uniform speed. Due to heavy rain its speed gets reduced by 10 km/h and as such it takes two hours longer to cover the total distance. Assuming the uniform speed to be 'x' km/h, form an equation and solve it to evaluate x.