Quantitative Aptitude - Arithmetic Ability Questions

In a class of 50 students there are 22 girls who scored an average of 35 marks in the test. What is the average marks of the boys if the class average is 42 marks?

If p and q are the roots of the equation x2 –15x + r = 0 and p –q = 1, then what is the value of r ?

A boat goes a certain distance at 40 km/hr and comes back the same distance at 24 km/hr. What is the average speed (in km/hr) for the total journey?

Arrange the given words in the sequence in which they occur in the dictionary.
1. Waste
2. Wrong
3. Witty
4. Worcester
5. Warlike

The mean of marks secured by 55 students in division A of class X is 58, 45 students of division B is 54 and that of 75 students of division C is 52. Find the mean of marks of the students of three divisions of Class X.

What is the rate of interest (in %) if simple interest earned on a certain sum for the 3 years is Rs 6,000 and compound interest earned for 2 years is Rs 4,160?

A student multiplied a number by 4/7 instead of 7/4. What is the percentage error in the calculation?

After deducting 60% from a certain number and then deducting 15% from the remainder, 1428 is left. What was the initial number?