In a certain code language, 'EARTH' is written as '5118208' and 'BOOK' is written as '2151511'. How will 'COUNTRY' be written in that language? 

Select the option in which the numbers are related in the same way as are the numbers of the following sets.
 NOTE: Operations should be performed on the whole numbers, without breaking down the numbers into its constituent digits. E.g. 13 – Operations on 13 such as adding /deleting /multiplying etc. to 13 can be performed. Breaking down 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed)

(48, 8, 12)
(42, 6, 14)

Select the letter-cluster from among the given options that can replace the question mark (?) in the following series.
AAI, AEI, AII, AOI, ?

In a certain code language, 'BALL' is coded as '27' and 'BACK' is coded as '17'. How will 'RACE' be coded in that language? 

Eight girls A, B, C, D, E, F, G and H are sitting in a row, facing towards the north (but not necessarily in the same order). Neither C nor D is at the extreme ends of the row. H is at the extreme right end of the row. Only E is sitting between D and F. Only G is sitting between F and H. C and A are the immediate neighbours of B.

Which of the following statements is/are correct?
 I. D is fourth to the left of H.
 II. D is the immediate neighbour of B.

What will come in the place of ‘?’ in the following equation, if ‘×’ and ‘ – ‘ are interchanged and also ‘+’ and ‘÷’ are interchanged?
 27 × 8 − 3 ÷ 4 + 2 = ? 

After interchanging the given two digits 4 and 6, what will be the value of the following equation?
 5 + 3 × 4 – 6 ÷ 2 = ? 

Six friends A, B, C, D, E and F are sitting around a circular table facing the centre (not necessarily in the same order). A sits third to the left of D. D sits to the immediate right of B. B sits second to the left of E. C sits second to the right of F. Who sits second to the right of A?