Quantitative Aptitude - Arithmetic Ability Questions

If 4x2 - 12x + k is a perfect square, then the value of k is

The number of students in a class is increased by 20% and the number now becomes 66. Initially the number was

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)?

In what time will Rs.4400 become Rs.4576 at 8% per annum interest compounded half-yearly?

Pihu and Aayu are running on a circular track of diameter 28m. Speed of Pihu is 48 m/s and that of Aayu is 40 m/s. They start from the same point at the same time in the same direction. When will they meet again for the first time?

Product of digits of a 2-digit number is 72. If we add 9 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

Find the value of 27a3 + 1a3, if 9a2 + 1a2 = 43

Which one of the following is true for 0°<θ<90°