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What should come in place of the question mark (?) in the given series?

23 40 57 74 91 ?

In a certain code language,
A + B means ‘A is the father of B’,
A - B means ‘A is the mother of B’,
A * B means ‘A is the sister of B’ and
A ÷ B means ‘A is the brother of B’.
Based on the above, how is P related to T if ‘P – Q * R + S ÷ T’?

A, B, C, D, E, F and G are sitting around a circular table facing the centre. B sits to the immediate left of F. C sits second to the right of F. E sits third to the left of B. D sits to the immediate right of A. How many people sit between G and D when counted from the left of G?

A, B, C, D, W, X and Y are sitting in a straight line, facing the north. Only two people sit to the right of X. Only two people sit between X and C. Only two people sit between A and D. D sits to the immediate left of X. B sits to the immediate right of Y. Who sits at the third position from the left end of the line?

In a certain code language, ‘FIRE’ is coded as ‘2739’ and ‘RISE’ is coded as ‘3978’. What is the code for ‘S’ in the given code language?

Select the triad which follows the same pattern as that followed by the two triads given below. Both triads follow the same pattern. NG-LE-JL KD-IB-GI

Counting to be done from left to right only. (NOTE: All numbers are single-digit numbers only.) SIR

(Left) 7 4 5 5 4 7 9 8 4 3 9 2 1 5 7 9 7 8 3 3 8 2 1 9 6 9 7 (Right)

How many such even digits are there, each of which is immediately preceded by an even digit and also immediately followed by an odd digit?

Seven boxes B, C, D, I, J, K and L are kept one over the other but not necessarily in the same order. Only I is kept above C. Only L is kept between C and J. Only K is kept below D. How many boxes are kept between B and I?

This question is based on the following words.

If in each of the words, each letter is changed to the letter immediately following it in the English alphabet, how many words will have their last letter as ‘E’?

Based on the English alphabetical order, three of the following four letter-clusters are alike in a certain way and thus form a group. Which is the letter-cluster that DOES NOT belong to that group? (Note: The odd one out is not based on the number of consonants/vowels or their position in the letter-cluster).