Quantitative Aptitude - Arithmetic Ability Questions

Rs. 782 is divided into 3 parts in the ratio 12:23:34, the first part is 

What is the value of tan4A + tan2A?

What is the value of [cos (90 + A)÷sec (270 – A)] + [sin (270 + A)÷cosec (630 – A)]?

What is the unit place digit in the expansion of  773?

A fan is listed at Rs. 150 with a discount of 20% . What additional discount must be offered to the customer to bring the net price to Rs. 108 ?

If 1 saree is offered free on purchase of 3 sarees, what is the effective discount on each saree?

Satheesh is two years older than Goutham who is twice as old as Sai. If the total of the ages of Satheesh, Goutham and Sai is 27, then how old is Goutham?

Seven years ago, the average age of A, B and C was 51 years. If A is 3 years older than B and B is 3 years older then C then the present ages of A, B and C are ( in year)