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?

What is the area (in sq cm) of a circle whose circumference is 22 cm?

Length and breadth of a rectangle are increased by 40% and 70% respectively. What will be the percentage increase in the area of rectangle?

If u+v = 10 and uv = 16, then find the value of u2-v2uv

If 1/√(1 -­ sin2A) = x, then the value of x is

What is the value of √[(1 ­- cosA)/(1 + cosA)]?

If the perimeter of a semicircle is 36 cm, then find its area (in cm2).

Working 5 hours a day, Shivam can read a book in 24 days. How many hours a day should he work so as to finish the same work in 8 days?