Quantitative Aptitude - Arithmetic Ability Questions

If N = 0.369369369369... and M = 0.531531531531..., then what is the value of (1/N) + (1/M)?

P and Q can do a project in 150 and 100 days respectively. In how many days can they complete 60% of the project if they work together?

What is the rate of interest (in %) if simple interest earned on a certain sum for the 3 years is Rs 6,000 and compound interest earned for 2 years is Rs 4,160?

If x3 – y3 = 81 and x – y = 3, then what is the value of x2 + y2?

A farmer travelled a distance of 61 km in 9 hours. He travelled partly on foot at a speed of 4 km/hour and partly on bicycle at a speed of 9 km/hour . The distance travelled on foot is

18 buckets of water fill a tank when the capacity of each bucket is 8 litres. How many buckets will be needed to fill the same tank, if the capacity of the bucket is 12 litres?

A trader sells wire and gains 60% on the cost price. What will be the profit % on selling price?

A vendor buys pens at the rate of 4 for Rs 5 and sells at the rate of 4 for Rs 3. What will be the result?