Quantitative Aptitude - Arithmetic Ability Questions

If P : Q : R = 6 : 7 : 8 and R : S = 3 : 5, then what is P : S?

A and B undertake a piece of work for Rs. 250 . A alone can do that work in 5 days and B alone can do that work in 15 days . With the help of C, they finish the work in 3 days . If every one gets paid in proportion to work done by them, the amount C will get is 

Present age of Anil and Rajesh are in the ratio of 11 : 6 respectively. 9 years ago, their ages were in the ratio of 7 : 3. If the Pankaj’s present age is 1/4 of the Anil’s present age, then what is the Pankaj’s present age (in years)?

ABC is a right angled triangle with angle A = 90 deg. Then the value of cos2A+cos2B+cos2C is

The mean score in a test of the 10 boys in a class was 15 while the overall mean of the 25 students in the class was 16.2. What was the mean score of the girls?

If in a two digit number, the digit at unit place is y and the digit at tens place is 5, then the number is

The difference between simple and compound interests compounded annually on a certain sum of money for 2 years at 16% per annum is Rs 320. What is the value of given sum (in Rs)?

What is the value of (4a2 + 8b + 14c + 2)/2 ?