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 ratio of simple interest earned on certain amount at the rate of 12% p.a. for 9 years and that for 12 years?

Prahlad has done 1/3rd of a job in 30 days, Sarfaraz completes the rest of the job in 90 days. In how many days can they together do the job?

The sum of all prime numbers between 58 and 68 is

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?

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 x + y = 12 and xy = 32, then what is the value of  x2 + y2 ?

Find the curved surface area (in cm²) of a hemisphere of diameter 28 cm