Quantitative Aptitude - Arithmetic Ability Questions

A and B have their annual average income Rs. 80,000.
B and C have their annual average income Rs. 75,000.
C and A have their annual average income Rs. 78,000.

The annual income of A is ?

What is the value of sin(11π/6)?

The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 5% per annum is Rs 45. The sum is

In a week, how many times are the hands of a clock at right angles with each other?

What is the area (in sq cm) of a circle whose circumference is 22 cm?

What is the value of √[(1 - sinA)/(1 + sinA)]?

What is the value of (1 + cotA)2 + (1 -­ cotA)2?

Find the LCM of 12, 16, 20 and 24.