Quantitative Aptitude - Arithmetic Ability Questions

Gautam goes to office at a speed of 12 kmph and returns home at 10 kmph.His average speed is

What is the average of all numbers between 9 and 90 which are divisible by 8?

If a + b + c = 11 and ab + bc + ca = 17, then what is the value of a3 + b3 + c3 – 3abc?

A discount series of 15%, 20% and 25% is equal to the single discount of?

Triangle ABC is similar to triangle PQR and AB : PQ = 2 : 3. AD is the median to the side BC in triangle ABC and PS is the median to the side QR in triangle PQR. What is the value of (BD/QS)2?

A sum fetched a total simple interest of Rs. 7056 at the rate of 8 percent per year in 7 years. What is the sum?

What is the average of all numbers between 11 and 80 which are divisible by 6?

In a right angled triangle if hypotenuse is 20 cm and ratio of other two sides is 4:3, the length of the sides are