Verbal Reasoning - Mental Ability Questions

In this question, some equations are solved on the basis of a certain system. On the same basis find out the correct answer from amongst the four alternatives for the unsolved equation.

7x6x8=678
8x9x7=987
6x5x7=567
5x4x6=?

In the following question, select the related number from the given alternatives.
243 : 819 : : 163 : ?

14 notebooks of a class were corrected with ink pen while 22 notebooks were corrected with colour pencil. If 4 notebooks were corrected with both, what is the strength of class?

Weight of C is twice the weight of M. Weight of M is 1/9 of the weight of R. Weight of R is 5/2 of the weight of K. Weight of K is 1/3 of the weight of G. Who is the second lightest?

In a certain code language, “LUNGS” is written as “OWQIV”. How is “HEART” written in that code language?

In the following question, select the related number from the given alternatives.
9143 : 9963 : : 6731 : ?

Choose the related word/letters/number from the given alternatives.
AF : BE : : ? : DH

A series is given with one term missing. Select the correct alternative from the given ones that will complete the series.
A, E, J, N, S, W, ?