Quantitative Aptitude - Arithmetic Ability Questions

The total surface area of a hemisphere is 4158 cm2. Find its diameter (in cm).

The average marks obtained by Raghav in 12 tests is 24. Zubeida has maintained an average of 23 so far but has taken only 9 of the tests. If each test is out of 30, at least how much Zubeida score in any one of the remaining three tests to still have a chance to match Raghav's performance?

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?

The ratio of three numbers is 5 : 6 : 8. If the sum of the three numbers is 380, then what is the smallest among the three numbers?

What is the measure (in degree) of an exterior angle of a regular polygon of 9 sides?

If [2(4x/5 - 3/4)]/3 - 5/3 = -1/6, then the value of x is?

The simplest form of 3565/1495 is

What is the value of cosec 5π/3?