Quantitative Aptitude - Arithmetic Ability Questions

A boat goes 8 km upstream and 12 km downstream in 7hours. It goes 9 km upstream and 18 km downstream in 9 hours. What is the speed (in km/h) of the boat in still water?

If a + b = 4 and ab = 3, then what is the value of a3 + b3?

If 5(4­-x) - ­4 < 3x - ­2 > 4x - 6; then the value of x is

If 170% of a number added to 66, then the result becomes equal to twice of the number. What is the number?

The average of four consecutive odd numbers is 64. What is the value of largest number?

The 5th and 9th term of an arithmetic progression are 7 and 13 respectively. What is the 15th term?

In 2 years at simple interest the principal increases by 8%. What will be the compound interest earned (in Rs) on Rs 10 lakhs in 2 years at the same rate?

If (x+1/x) = 5, then the value of 5xx2+5x+1?