Quantitative Aptitude - Arithmetic Ability Questions

The total surface area of a hemisphere is 166.32 sq cm, find its radius?

If 20 men working 8 hours per day can complete a piece of work in 21 days. How many hours per day must 48 men work to complete the same job in 7 days?

X and Y started a business by investing Rs 171000 and Rs 243000 respectively. If X’s share in the profit earned at the end of year is Rs 3800, then what will be the total profit (in Rs) earned by them together?

The mean of 12 observations is 15. One more observation is included and the new mean becomes 16. The 13th observation is

In an army selection process, the ratio of selected to unselected was 3:1. If 60 less had applied and 30 less selected, the ratio of selected to unselected would have been 5:1. How many candidates had applied for the process?

What is the value of Tan 45° - 1/√3 Sec 60°?

The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?

If the shopkeeper sells an item at Rs 450 which is marked as Rs 600, then what is the discount he is offering?