A sum of money invested at a certain rate of simple interest amounts to ₹7400 in 6 years and to ₹8200 in 8 years. The rate of interest per annum, is:

An item is marked for sale at ₹7,200. A dealer allows a discount of 10% and yet makes a profit of 8%. What would have been his gain percentage, if no discount was allowed?

The average of 11 consecutive even numbers written in ascending order is 30. What is the average of the 3rd and the 10th number?

Vinay saves 10% of his income. If his income increases by 16%, and his saving increases by 10%, then what percentage does his expenditure increase?

A car covers a distance of 75 km at a speed of 60 km/hr. It covers the next 5 km at a speed of 12 km/hr and the last 40 km at a speed of 36 km/hr. The average speed of the car during the entire journey (in km/hr) is:

There are 48 students in a college union and the ratio of the number of boys to the number of girls is 5:3. The number of girls to be included in this union, so that the ratio of the number of boys to number of girls become 6:5, is:

Two trains 'A' and 'B' started running at the same time. Train 'A' takes 3 hours more than train 'B' to cover 540 km. But if train 'A' doubles its speed, it covers 540 km in 1½ hours less than train 'B'. What is the speed (in km/h) of train 'B'?

The cost of manufacturing a car depends upon three items: cost of material, labour and overheads. In a year, the cost of these items were in the ratio 4:3:2. Next year the cost of material increased by 10%, cost of labour increased by 8% but cost of overheads reduced by 5%. If sa…

Two pipes 'A' and 'B' can fill a water tank in 30 minutes and 20 minutes, respectively. Initially pipe 'A' was opened and after 5 minutes, pipe 'B' was also opened. Find the total time (in minutes) taken by the pipes to fill the tank.