Quantitative Aptitude - Arithmetic Ability Questions

If 1/2 is added to a number and the sum is multipled by 3, the result is 21. Then the number is

If (5x – y)/(5x + y) = 3/7, then what is the value of (4x2 + y2 – 4xy)/(9x2 + 16y2 + 24xy) ?

In a mixture, unbroken and broken rice grains are in the ratio 3 : 2. How much fraction of the mixture must be drawn off and substituted with broken grains, so that the ratio of unbroken and broken grains becomes 1 : 1?

39 is 5.2% of?

A number is decreased by 10% and the resulting number is again decreased by 20%. What is the final percentage of decrease?

If the product of two numbers is 2400 and their LCM is 96 then their HCF is

At what rate of compound interest per annum will a sum of Rs 50000 become Rs 73205 in 2 years?

What is the unit digit of the sum of first 111 whole numbers?