Given expression, (50 x 2) W (28 T 4)
After interchanging the letters with symbols, we get
(50 ÷ 2) + (28 x 4)

Correct Option: C

Given expression, (50 x 2) W (28 T 4)
After interchanging the letters with symbols, we get
(50 ÷ 2) + (28 x 4) = 25 + 112 = 137

Rules
(i) (Odd number) x (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Hint
1st Row 7   21   3 ⇒ 7 x 21 = 147       [rule (i)]

Correct Option: C

Rules
(i) (Odd number) x (Composite odd number)
(ii) (Even number) + (Odd number)
(iii) (Even number) → (Perfect square number), then (Perfect square number) - (Even number)
(iv) (Odd number) ÷ (Prime odd number)
(v) (Odd number) - (Even number)
Solution
1st Row 7   21   3 ⇒ 7 x 21 = 147       [rule (i)]
⇒     147 ÷ 3 = 49 = d     [rule (iv)]
2nd Row d   7   33 ⇒ 49   7   33
⇒         49 ÷ 7 = 7   [rule (iv)]
⇒       7 x 33 = 231     [rule (i)]
∴ Resultant of second row = 231

Change the proper sign according to question and try all option one by one by applying the BODMAS Rule.

Correct Option: B

Change the proper sign according to question and try all option one by one by applying the BODMAS Rule.
'-' ⇒ ÷
'+' ⇒ '-'
÷ ⇒ 'x'
'x' ⇒ '+'
∴ 70 ÷ 2 - 4 x 5 + 6 = 21
⇒ 35 - 20 + 6 = 21
⇒ 15 + 6 = 21
⇒ 21 = 21

Using the proper symbols in question and solve all option one by one.

Correct Option: C

Using the proper symbols in (c), we get
5 x 2 ÷ 2 < 10 - 4 + 8
⇒ 5 x 1 < 18 - 4 ⇒ 5 < 14
which is true.

Try all option one by one.

Correct Option: D

6 * 4 * 12 * 12
From option (d),
6 x 4 - 12 = 12
⇒ 12 = 12