Quantitative Aptitude - Arithmetic Ability Questions

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

The ratio of the volume of two cylinders is 7 : 3 and the ratio of their heights is 7 : 9. If the area of the base of the second cylinder is 154 sq. cm, then what will be the radius (in cm) of the first cylinder?

What is the value of 5/9 + 7/8?

Reflection of the point (-3,6) in the x-axis is

What is the reflection of the point (2, -3.5) in the y-axis?

Rohit buys a ball for Rs 450 and sells it. Rohit gives two successive discount of 20% and 5% to the customer. What will be the selling price (in Rs) of the ball?

If a+1b = 1 and b+1c = 1 then c+1a = ?

Find the median, mode and mean of 9, 5, 8, 9, 9, 7, 8, 9, 8.