Quantitative Aptitude - Arithmetic Ability Questions

Find the third proportional to 6 and 12.

A and B together can complete a task in 12 days. However, if A works alone, completes half the job and leaves and then B works alone and competes the rest of the work, it takes 25 days in all to complete the work. If B is more efficient than A, how many days would it have taken B to do the work by herself?

A labourer can do a job in 50 hours. After 5 hours he takes a break. What fraction of the job is yet to be done?

3/5 as a decimal fraction?

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 marks his goods in such a way that after allowing a discount of 10% he gains 15%. If an article costs him Rs. 720, his marked price is

In a class of 60 students there are 20 girls who scored an average of 40 marks in the test, what is the average marks of the boys if the class average is 60 marks?

25% discount is offered on an item. By applying a promo code the customer wins 4% cash back. What is the effective discount?