Explanation

6,

6×6=36,

7,

7×7=49,

5, 

5 x 5 = 25

Explanation

Now Maryam was shifted to 4 places to the right.

This implies her place is x+4 from left now, but it is given that her new place is 12th from left.

Now, in a row of 21 girls, her place is 8,

which is 14th place from right.

Explanation

A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z.

ANPL 

BOOK 

the next alphabet of A is B, N is O,

the before alphabet of P is O, K is L

so 

GZOE 

HAND 

the next alphabet of G is H, Z is A

the before alphabet of N is O, D is E

Explanation

Let the required number of labourers be x

Less working hour/day, More labours (Indirect proportion)

More days, fewer labourers (Indirect proportion)

Explanation

Total no. of students = Top position + Bottom position - 1

Total no. of  students =16+49−1

                                      = 64

****

Number of students in the class $=(15+1+48)=64$

Explanation

A Man is to a woman

as a boy is to a Girl

Explanation

Clearly, the number of trees in the row =(4+1+4)=9.

Explanation

 A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z.

7 + 2 -1 = H

9 - 1 = 8 

H is the 8th number in the alphabetical series

22 + 6 -5 = W

28 - 5 = 23

W is the 23rd number in the alphabetical series

11 + 6 -2 = ?

17 - 2 = 15 

 O is the 15th number in the alphabetical series

Explanation

 Plant: Tree: Girl: Women 

The plant grows into a tree while the girl grows into a woman

 logic:  first grows into the second.

Explanation

LCM of 1/10 + 1/40 = 1/8

Number of days to complete the total work = 8 days