Quantitative Aptitude - Arithmetic Ability Questions

If the perimeter of a semicircle is 36 cm, then find its area (in cm2).

If 3a+4b3c+4d = 3a-4b3c-4d, then 

Ravi had five subjects in his final examination. The maximum marks in each subject are 100. If his percentage in four subjects is 80, and he scores 65 marks in the fifth subject, determine his overall percentage for the five subjects.

The LCM of 56, 84 and 112 is

A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km/hr) of the boat in still water?

√(cosec2 -­ 1)/cosecA is equal to?

If 7 times the seventh term of an Arithmetic Progression (AP) is equal to 11 times its eleventh term, then the 18th term of the AP will be

Which one of the following is the minimum value of the sum of two integers whose product is 24?