Quantitative Aptitude - Arithmetic Ability Questions

Which one of the following is an irrational number?

A solid hemisphere has radius 14 cm. It is melted to form a cylinder such that the ratio of its curved surface area and total surface area is 2 : 3. What is the radius (in cm) of its base?

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 x/2 - [4(15/2 - x/3)]/3 = -x/18, then what is the value of x?

If cos 240° = x, then value of x is

Cost of 4 pens, 6 note books and 9 files is Rs 305. Cost of 3 pens, 4 notebooks and 2 files is Rs 145. What is the cost (in Rs) of 5 pens, 8 notebooks and 16 files?

Find the odd word/letters/number pair from the given alternatives

In what ratio is the segment joining (12,­1) and (-­3,4) divided by the Y­-axis?