A wholesaler sells a good to a retailer at a profit of 5% and the retailer sells it to a customer at a profit of 10%. If the customer pays Rs. 2,000, what had it cost (in Rs) the wholesaler?

The average marks of 40 students in an examination was 34. It was later found that the marks of one student had been wrongly entered as 62 instead of 26. what is the correct average?

The ratio of present ages of P and Q is 7:9. Before 10 years the ratio of their ages was 5:7. What is Q's present age (in years)?

If 1 shirt is offered free on purchase of 4 shirts, what is the effective discount (in %) on each shirt?

What is the area (in sq cm) of a regular hexagon of side 9 cm?

A and B together do a job in 12 days and A could do the job in 20 days if he worked alone. How many days would B take to do the job if he worked alone?

What least number must be subtracted from 518, so that the sum is completely divisible by 13?

Which of the following is a major river in Bangladesh which is also the main distributary of the Ganges?