Quantitative Aptitude - Arithmetic Ability Questions

If x2 + (1/x2) = 1, then what is the value of x48 + x42 + x36 + x30 + x24 + x18 + x12 + x6 + 1?

The smallest angle of a triangle is 40° less than the largest angle. If the largest angle is 80°, then find the third angle of the triangle

The average of 9 observations was found to be 35. Later on, it was detected that an observation 81 was misread as 18. The correct average of the observations is

If the numbers  93, 204, 256 are arranged in ascending order, then the right arrangement is 

The average age of A and B is 18 years. After 3 years, C joins them and the average ages of A, B and C becomes 22 years. The age of C is ?

If 2cosec2A = x, then the value of x is

Select the odd word/letters/number/number pair from the given alternatives.

At what point does the line 3x + 2y = 12 cuts the Y-axis?