Quantitative Aptitude - Arithmetic Ability Questions

The area of a square is 40.5 cm². Find the length of its diagonal (in cm).

What is the sum of a3+b3+c3-3abc, when the value of a=4, b=2 and c=-6?

On a certain principal if the simple interest for two years is Rs 1400 and compound interest for the two years is Rs 1449, what is the rate of Interest?

If P = 350 and Q = 600, then P is how much percentage less than Q?

If x+1x ≠0 and x3+1x3 = 0, then the value of x+1x4 is :

5 hrs after a goods train passed a station, another train travelling at a speed of 70 km/hr following that goods train passed through that station. If after passing the station the train overtakes the goods train in 9 hours. What is the speed of the goods train?

In a committee there are 15 members. If two members whose ages are 45 years and 55 years are replaced by the two new members, then average age of 15 members is increased by 2 years. What is the average age (in years) of the new members?

Mr. Kapur purchased two toy cycles for Rs 750 each. He sold these cycles, gaining 6% on one and losing 4% on the other. The gain or loss percent in the whole transaction is