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If + means −, − means ×, × means ÷ and ÷ means +, then what will come in place of the question mark (?) in the following equation?

25 − 16 ÷ 79 + 189 × 3 = ?

Six people, A, B, C, D, E and F are sitting in a row, facing north. Only two people sit to the right of C. A sits second to the left of D. B sits to the immediate right of F. E sits second to the left of C. How many people sit between D and B?

In a certain code language, ‘she takes photos’ is coded as ‘rp bs eg’ and ‘photos are beautiful’ is coded as ‘zs vx bs’. How is ‘photos' coded in that language?

In a certain code language,
A + B means ‘A is the sister of B’,
A @ B means ‘A is the brother of B’,
A - B means ‘A is the wife of B’, and
A # B means ‘A is the father of B’.
How is O related to V if ‘O - P # T + G @ V’?

In the following triads, each group of letters is related to the subsequent one following a certain logic. Select from the given options, the one which follows the same logic.

DEAR - EADR - RAED
SOME - OMSE - EMOS

Which of the following letter-number clusters will replace the question mark (?) in the given series to make it logically complete?

FEL221, NMT202, VUB183, DCJ164, ?

If 2 is added to each odd digit and 2 is subtracted from each even digit in the number 178673, then what will be the sum of largest and smallest digits in the new number thus formed?

Read the given statement(s) and conclusions carefully. Assuming that the information given in the statement(s) is true, even if it appears to be at variance with commonly known facts, decide which of the given conclusions logically follow(s) from the statement(s).

Statements:
All samosas are patties.
All samosas are burgers.

Conclusions:
(I) Some patties are burgers.
(II) All burgers are samosas.

F, G, H, I, M, N and O are sitting around a circular table, facing the centre of the table. Only two people sit between I and O, when counted from the left of O. G sits third to the left of N. H sits to the immediate right of N. H sits second to the left of I. F is not an immediate neighbour of G. Who sits third to the right of M?

RY 17 is related to VW 3 in a certain way. In the same way, IK 11 is related to MI −3. To which of the following is PI 16 related, following the same logic?