Quantitative Aptitude - Arithmetic Ability Questions

Select the odd word from the given alternatives.

Find k, if the line 4x - y = 1 is perpendicular to the line 5x - ky = 2?

If (a + b)/c = 6/5 and (b + c)/a = 9/2, then what is the value of (a + c)/b?

When a number is increased by 69, it becomes 103% of itself. What is the number?

In the question, two equations I and II are given. You have to solve both the equations and give answer

$$\begin{gathered} x2-11x+28=0 \\ y2-18y+81=0 \end{gathered}$$

If x = 313- 3-13, then 3x3 + 9x value is

An aeroplane flying horizontally at a height of 3 Km. above the ground is observed at a certain point on earth to subtend an angle of 60°. After 15 sec flight, its angle of elevation is changed to 30°. The speed of the aeroplane (taking √3 = 1.732) is

Direction: What should come in the place of question mark (?) in the following number series? 24, 25, ?, 41, -8, 73