Quantitative Aptitude - Arithmetic Ability Questions

A person lent certain sum of money at 10% per annum simple interest. In 20 years the interest amounted to Rs 500 more than the sum lent. What was the sum lent (in Rs)?

A sum of Rs. 1200 is lent to be paid back in 5 equal annual installments of Rs. 264 each. The rate of interest per annum is

In a class there were 28 boys and some girls. In a test the mean score obtained by the boys was 12.5 while that obtained by the girls was 14.5. If the overall average was 13.1, what was the total number of students in the class?

What is the fourth proportional to 72, 168 and 150?

The average marks obtained in a class of 50 students is 70%. The average of first 25 is 60% and that of 24 is 80%. What is the marks obtained by the last student?

If 9x - [5(2x + 1)/2] = 9/2, then the value of x is?

An equilateral triangle of side 6 cm is inscribed in a circle. Then radius of the circle is

If x + √5 = 5 + √y, and x, y are positive integers, then the value of x+yx + y