Quantitative Aptitude - Arithmetic Ability Questions

What will be the maximum power of 8 that exactly divides 25!?

If x2 + ax + b, when divided by x + 3, leaves a remainder of -1 and x2 + bx + a, when divided by x - 3, leaves a remainder of 39, then a+ b = ?

The sum of digits of a two-digit number is 9. When the digits are reversed, the number decreases by 45. Find the changed number.

At 8% simple interest per annum a sum of money becomes Rs. 300 in 2.5 years. What was the sum invested?

The simple interest on a certain sum of money invested at a certain rate for 2 years amounts to Rs. 1200. The compound interest on the same sum of money invested at the same rate of interest for 2 years amounts to Rs. 1290. What was the principal?

G and AD are respectively the centroid and median of the triangle ΔABC.The ratio AG:AD is

A, B and C can complete a task together in 10 days. A and B would need 12 days if only the two of them worked, while B and C would take 20 days if only the two of them worked. If B worked alone, how many days would she take to complete the task?

If cos -225° = x, then the value of x is