S + 5 = X

T + 5 = Y

D + 5 = I

Y + 5 = D

Similarly,

R + 5 = W

O + 5 = T

M + 5 = R

S + 5 = X

A + 3 = D; D + 3 = G; G + 3 = J; J + 3 = M; M + 3 = P; P + 3 = S

D – 3 = A; A – 3 = X; X – 3 = U; U – 3 = R; R – 3 = O; O – 3 = L

H + 3 = K; K + 3 = N; N + 3 = Q; Q + 3 = T; T + 3 = W; W + 3 = Z

111 + 8 = 119

119 + 16 = 135

135 + 24 = 159

159 + 32 = 191

191 + 40 = 231

C – 2 = A; A – 2 = X; X – 2 =V; V – 2 = T; T – 2 = R

24 – 5 = 19; 19 – 5 = 14; 14 – 5 = 9; 9 – 5 = 4; 4 – 5 = 25

X + 3 = A; A + 3 = D; D + 3 = G; G + 3 = J; J + 3 = M

Using the formula (a – b)²,

(2 – 3)² = 1,

(3 – 1)² = 4,

(1 – 4)² = 9,

(4 – 9)² = 25,

(9 – 25)² = 256.

As in general, we add 2 with original value.

C – 5, H – 10, A – 3, R – 20, C – 5, O – 9, A – 3, L – 14

Similarly,

B – 4, L – 14, A – 3, C – 5, K – 13, H – 10, E – 7, A – 3, D – 6.

From North, right turn means East and left turn means West.

Ashish is facing East and Vikas is facing West.

Ashish takes right turn from East i.e, he is facing South.

Vikas takes right turn from West, ie, he is facing North.

Ravi > Puja > Simpy > Neha > Sonia = Abhijeet > Abhishek.

Puja is 6^th from the left end and Somya is 11^th from the left end

Number of person between Puja and Somya = (12 – 6) - 1 = 5

As Radha is exactly between Puja and Somya, so her position from the left end is (12 – 3) or (6 + 3) = 9^th from the left.

Radha’s position from the right end = (21 – 9) + 1 = 13

150 ÷ 250 x 50 + 50 – 2 = 55

After changing symbols, we get:

150 + 250 ÷ 50 – 50 x 2 = 55

L.H.S = 150 + 250 ÷ 50 – 50 x 2

= 150 – 95

= 55 = R.H.S