Quantitative Aptitude - Arithmetic Ability Questions

A student, by mistake, wrote 64 in place of 46 as a number at the time of finding the average of 10 given numbers & got the average as 50. The correct average of the numbers is

What will be the average of all the prime numbers before 19?

If x tan 60° + cos 45° = sec 45° then the value of x2 + 1 is

If a + b = 10 and ab- 13 = -ba - 11, then what is the value of 3ab + 4a2 + 5b2 ?

The simplified form of (x + 3)2 + (x - 1)2 is

If 2x - 2(3 + 4x) < -1 - 2x > -5/3 - x/3; then x can take which of the following values?

Tanya got an increment of 15% in her salary. If her enhanced salary is Rs.14,030. What was her original salary?

If a3 + b 3 = 35 and ab = 6, then what is the value of a + b?