Quantitative Aptitude - Arithmetic Ability Questions

What is the curved surface area (in cm²) of a hemisphere of diameter 42 cm?

What is the time taken by a 180 m long train running at 54 kmph to cross a man standing on a platform?

If a2+1=a, then the value of a3 is

The average of 10 numbers is 30. If at the time of calculation one number was wrongly taken as 36 instead of 69, then what will be the correct average?

The least number to be added to 435 to make it a perfect square is

Simplify (2/7 + 3/5) / (2/5 + 2/7)

If three successive discounts of 20%, 30% and 40% are given, then what will be the net discount (in percentage)?

Select the odd word/letters/number/number pair from the given alternatives.