Quantitative Aptitude - Arithmetic Ability Questions

If a + b = 3 and ab = -4, then what is the value of a3 + b3?

What should be the average speed of a car to cover a distance of 189 km in 3.5 hours?

A car travels a certain distance at 70 km/h and comes back at 30 km/h. Find the average speed for total journey.

When 0.090909.....is converted into a fraction, then the result is

Manish is four times as efficient as Puneet. Manish takes 90 days less than Puneet to complete a book. If both of them work together, then in how many days the book will be completed?

If 2x + 6y = 3xy and 10x -­ 3y = 4xy, find x, y.

If 5(4­-x) - ­4 < 3x - ­2 > 4x - 6; then the value of x is

Find out the odd word/letters/number/number pair from the given alternatives.