Quantitative Aptitude - Arithmetic Ability Questions

The 2nd and 6th term of an arithmetic progression are 8 and 20 respectively. What is the 20th term?

If compound interest received on a certain amount in the 3rd year is Rs. 1,240, what will be the compound interest (in Rs) for the 4th year on the same amount at 9% rate of interest?

If 2y cosθ = x sinθ and 2x secθ - y cosecθ = 3 then what is the value of x2+4y2

The percentage change of a number when it is first decreased by 10% and then increased by 10% is

An engineering student has to secure 25% marks to pass. He gets 45 and fails by 45 marks. Find the maximum marks.

If 15 persons can do a job in 30 days, then 30 persons with twice the efficiency can do the same job in how many days?

If √[(1 + cosA)/2] = x, then find the value of x.

If the perimeter of a semicircle is 108 cm, then find its area (in cm²).