Quantitative Aptitude - Arithmetic Ability Questions

When a discount of 20% is given on a lunch buffet, the profit is 42%. If the discount is 15%, then the profit is

Sum of twice a fraction and its reciprocal is 17/6. What is the fraction?

What is the least number of complete years in which a sum of money put out at 40% annual compound interest will be more than trebled?

What is the value of 1+aa1/2+a-1/2-a1/2+a-1/21+a+a-1/2 ?

The population of a town is 200000. It increases annually at the rate of 10%. What will be the population after 2 years?

If 3A = 7B = 13C, then A : B : C is equal to

The third proportional of two numbers 7 and 21 is

The area of a rectangle in 60 sq.cm and its perimeter is 34 cm, then the length of the diagonal is