Quantitative Aptitude - Arithmetic Ability Questions

Azhar is 4 times as good a workman as Balaraj and therefore is able to finish a job in 45 days less than Balaraj. Working together, they can do it in:

The sum of the present ages of two cousins is 46 years. Eight years ago, the elder one was twice as old as the younger one. What is the present age of the elder cousin?

If xy = -30 and x2 + y2 = 61, then find the value of (x + y).

The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.

If A has got 20% more marks than B, then by what percent marks of B are less than the marks of A?

The ratio of the present ages of Aman and Ankit is 2 : 1 and the sum of their present ages is 72 years. What will be the Aman's age (in years) after 6 years?

A train, 200 m long, is running at a speed of 54 km/hr. The time in seconds that will be taken by train to cross a 175 m long bridge is

Two numbers are more than the third number by 16.25% and 55% respectively. First number is what percentage of the second number?