Quantitative Aptitude - Arithmetic Ability Questions

In the given figure, AP = 3cm, AR = 6cm and RS = 9cm, then what is the value (in cm) of PQ?

If a shopkeeper sells an item at Rs 4200 which is marked as Rs 4800, then what is the discount (in %) that he is offering?

If 7A = 5B = 2C; find A : B : C.

If (x – y) = 7, then what is the value of (x – 15)3 – (y – 8)3?

A sum of Rs 2000 becomes Rs 3645 in 2 years at a certain rate of compound interest. What will be the sum (in Rs) after 4 years?

20 boys do one fourth of work in 25 days. How many more boys will be required to complete the remaining work in 50 days?

In an ornament the ratio of gold and copper is 3:2. The percentage of gold in the ornament is:

What is the value of cosec 3π/4?