List of top Arithmetic and Mental Ability Questions

A certain sum becomes 8 fold in 15 years at simple interest. What will be the rate of interest?
If the price of petrol increased by 20%, by what percentage should the consumption be decreased by the consumer so that the expenditure on petrol remains unchanged?
By selling a table at Rs 475, a person loses 5%. To get a gain of 5%, he should sell the table for:
In a class there are 48 students. The ratio of number of boys to number of girls is 5:3. The number of girls to be added to the class so that the number of boys to girls is 6:5 is?
Arun starts a business with Rs. 8000 and Avinash joined him after 6 months with an investment of Rs. 40000. What will be the ratio of the profits of Arun and Avinash at the end of the year?
Find the missing number in the series: 6, 3, 3, 6, 24, ?
John has two pieces of rope, one is 18 meters long and the other is 15 meters long. He wants to cut them into smaller pieces of equal length without any rope left over. How many pieces will he have in total?
Two small boats are sailing in the sea on the two sides of a big ship. The angle of elevation of the top of the big ship is observed from the boat are 30 degree and 45 degree. If the height of the big ship is 200 meters as measured from the surface of the sea, calculate the distance between two small boats?
Find the wrong number in the series. 3, 31, 131, 351, 739, 1343, 2211, 3291, 4931
An Air Traffic Controller is watching from the control tower a plane which was moving from the tower. The plane makes the angle of depression of 60 degree with ATC's eye when at the distance of 100 meters from the tower. After 20 seconds the angle of depression becomes 45 degree. Calculate the speed of the moving plane.
In how many different ways can the letters of the word MUSIC be arranged?
Simplify: 9 X 99 X 999
Simplify: 976548 X 9999
The height of the tree is 6\(\sqrt{3}\) meters. The length of its shadow is 6 meters. What is the angle of elevation of the sun?
The average mark in the chemistry practical exam of a class of 40 students is 100. But one student's mark was entered wrongly as 50 instead of 100. What would be the correct average?
A furniture was sold for 1,10,000 with a profit of 10%. If it were sold for 80,000 rupees, then what would have been the percentage of profit/loss?
A dishonest shop owner advertises to sell his goods at Cost Price. But he uses a weight of 900 gms for a kg of weight. What is his gain %?
X takes 4 hours to reach destination A from destination B. Y takes 8 hours to reach destination A from destination B. What would be the ratio of speed of X:Y ?
In a ship there was stock of food for 200 days for 2000 persons. After 30 days, 1000 persons left the ship. For how may days shall the left-over food last for the remaining persons?
X can complete a piece of work in 4 days. Y can complete the same work in 5 days. How many days will it take to complete the same work if X and Y work together?
X can run 1 km in 4 min 10 seconds and Y can cover the same distance in 4 min 20 seconds. By what distance can X beat Y?
What is the angle between hour and minute hand of a clock at 6.30?
The original length of a rectangular sports ground was 100 meter and breadth 25 meters. After carrying out some alignment changes, the length becomes 50 meter and breadth becomes 75 meters. What is the percentage change in area?
The cost of 12 fans and 21 tables is 30000. What is the cost of 8 fans and 14 tables?
X and Y can complete a piece of work in 20 days and X alone in 40 days. In how many days Y alone can complete the work?