Quantitative Aptitude - Arithmetic Ability Questions

The average of marks obtained by 100 candidates in a certain examination is 30. If the average marks of passed candidates is 35 and that of the failed candidates is 10, what is the number of candidates who passed the examination?

Among three numbers, the first is twice the second and thrice the third. If the average of three numbers is 396, then what is the difference between the first and the third number?

A mixture contains spirit and water in the ratio of 3 : 2. If it contains 3 litres more spirit than water, the quantity of spirit in the mixture is

The compound interest earned in two years at 12% per annum is Rs 10176. What is the sum (in Rs) invested?

If 4(4x + 5) > 2x - 1 > 4x - 3, then the value of x is

If 2x+ 4(x - 3) < -2 - x < 2x - 1, then find the value of x.

If 5/6th of 7/6th of a number is 140, then 9/4th of that number is

What is that least number that must be added to the product 684 × 686 to make it a perfect square?