Quantitative Aptitude - Arithmetic Ability Questions

For the inequation x^2–7x + 12 > 0, which one of the following is correct ?

If 2cosec2A = x, then the value of x is

The area of a square is 72.25 cm². Find its perimeter (in cm).

Mahmood can do a piece of work in 40 hours. If he is joined by Janaki who is 50% more efficient, in what time will they together finish the work?

Of the 5 numbers whose average is 78, the first is 2/11 times the sum of other 4. The first number is

The radius of a sphere and hemisphere are same. The ratio of their total surface area is

Solve : 8,23,199.98 × 99.92 = ? × 80,000

The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is: