Verbal Reasoning - Mental Ability Questions

The weights of 4 boxes are 10, 40, 50 and 80 kilograms. Which of the following cannot be the total weight, in kilograms, of any combination of these boxes and in a combination a box can be used only once?

Select the related word/letters/numbers from the given alternatives:
ECFG : FDGH :: SQTU : ?

From the given alternative words, select the word which cannot be formed using the letters of the given word:

MEASUREMENT

A series is given with one term missing. Choose the correct alternative from the given ones that will complete the series.

RS, WX, BC, ?

In a certain code language, '+' represents 'x', '-' represents '+', 'x' represents '÷' and '÷' represents '-'. What is the answer to the following question?
642 x 6 ÷ 25 + 4 = ?

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

Select the missing number from the given alternatives?

A word is represented by only one set of numbers as given in any one of the alternatives. The sets of numbers given in the alternatives are represented by two classes of alphabets as shown in the given two matrices. The columns and rows of matrix-I are numbered from o to 4 and the matrix-II are numbered from 5 to 9. A letter from these matrices can be represented first by its row and next by its column, for example, F can be represented by 13, 21 etc and Y can be represented by 97,98 etc. Similarly, you have to identify the set of the word 'TONE'