Quantitative Aptitude - Arithmetic Ability Questions

If the product of two numbers is 4941 and their LCM is 81, then their HCF is :

Find the L.C.M of 4/5, 2/3 and 5/7.

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

In the following question, select the odd number pair from the given alternatives.

The ratio of three numbers is 2 : 3 : 5. If the sum of the three numbers is 275, then what is the largest among the three numbers?

What is the length of the side of a regular hexagon, if its area is 54√3 sq cm?

If a3 + b3 = 28 and a + b = 4, then what is the value of ab?

Two numbers are 90% and 75% lesser than a third number. By what % should the first number be increased so that it becomes equal to the second number?