Quantitative Aptitude - Arithmetic Ability Questions

A car travels from A to B with 40 Km/h and returns from B to A with 60 Km/h. Its average speed during the whole journey is

If 169 is subtracted from the square of a number, then the result obtained is 7056. What is the number?

If a merchant offers a discount of 25% on the list price, then he makes a loss of 5%. What % profit or % loss will he make if he sells at a discount of 10% of the list price?

If A is equal to 20% of B and B is equal to 25% of C; then what percent of C is equal to A?

614% of 1600 + 1212% of 800 is equal to

In the question, two equations I and II are given. You have to solve both the equations and give answer

$$\begin{gathered} x2-11x+28=0 \\ y2-18y+81=0 \end{gathered}$$

If a(a + b + c) = 45, b(a + b + c) = 75 and c(a + b + c) = 105, then what is the value of (a2 + b2 + c2 )?

A pentagonal prism has 15 edges. How many vertices does it have?