Quantitative Aptitude - Arithmetic Ability Questions

When a number is increased by 120, it becomes 130% of itself. What is the number?

The mean of 20 observations is 19. One more observation is included and the new mean becomes 20. The 21st observation is

In a trapezium, one diagonal divides the other in the ratio 2 : 9. If the length of the larger of the two parallel sides is 45 cm, then what is the length (in cm) of the other parallel side?

For x = 462+3, what is the value of x+22x-22+x+23x-23

In the given figure, in a right angle triangle ABC, AB = 12 cm and AC = 15 cm. A square is inscribed in the triangle. One of the vertices of square coincides with the vertex of triangle. What is the maximum possible area (in cm.sq) of the square?

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

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

A missile travels at 1206 km/h. How many metres does it travel in one second?

A can do a work in 36 days and B in 12 days. If they work on it together for 3 days, then what fraction of work is left?