Quantitative Aptitude - Arithmetic Ability Questions

If a sum of money doubles itself in 8 yrs, then the interest rate in percentage is ?

A sum of money invested for 2 yrs and 9 months at the rate of 8% simple interest per annum became Rs.732 at the end of the period. What was the sum that was initially invested?

Six year ago Parvez’s age was same as the present age of Manish. If the present age of Parvez is one-fourth more than that of Manish's present age, then in how many years will Parvez’s age become double of Manish’s present age?

If the diameter of a sphere is 14 cm, then what is the surface area (in sq.cm) of the sphere?

If the sum of squares of three consecutive natural number is 2702. Then, what will be the middle number?

The sum of three consecutive even numbers is 42. Find the middle number.

If x = 1 + √2 + √3 , then the value of 2x4 - 8x3 - 5x2 + 26x - 28 is

α and β are the roots of quadratic equation. If α + β = 8 and α – β = 2√5, then which of the following equation will have roots α4 and β4?