Quantitative Aptitude - Arithmetic Ability Questions

Manish, Mukesh and Sachin are Accountants. Mukesh can filea return in 5 hours and Sachin in 4 hours alone. All three together can do it in 2 hours. In what time (in hrs) will Manish do the work?

The ratio of present ages of Ramya and Saurabh is 8:7. After 10 years the ratio of their ages will be 12:11. What is Ramya's present age?

In each of the following questions two equations I and II are given. Solve both the equations and give answer:
$$\begin{gathered} I. x2+2x-195=0 \\ II. y2+30y+225=0 \end{gathered}$$

Find the odd word/letters/number from the given alternatives.

When a number is increased by 28, it becomes 107% of itself. What is the number?

The height and the slant height of a right circular cone are 24 cm and 25 cm, respectively. Considering π as 22/7 , find the curved surface area of the said cone.

What is the area (in sq cm) of a regular hexagon of side 6 cm?

At what point does the line 4x - 3y = -6 intercept the y-axis?