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?

1/3 part of a certain journey is covered with the speed of 25 km/hr, 1/2 part of the journey is covered with the speed of 45 km/hr and the remaining part covered with the speed of 37.5 km/hr. What is the average speed (in km/hr) for the whole journey?

The sum of the ages of Rohit and Ankit is 78. Rohit's age is twice the age of Ankit. What is the age (in years) of Rohit?

A right circular cylinder is partially filled with water. Two iron spherical balls are completely immersed in the water so that the height of the water in the cylinder rises by 4 cm. If the radius of one ball is half of the other and the diameter of the cylinder is 18 cm, then the radii of the spherical balls are

Which of the following equations has real and distinct roots?

If a + b = 1, then a4 + b4 - a3 - b3 - 2a2b2 + ab is equal to

Divide Rs. 368 in the ratio 1:5:8:9. The rupees in the respective ratios are given by

If x1x2x3 = 4(4 + x1 + x2 + x3 ), then what is the value of [1/(2 + x1 )] + [1/(2 + x2 )] + [1/(2 + x3 )]?