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The logic followed here is:

Given:

"The music sounds sweet" → la ma na ta

"The music sounds loud" → la ma pa ta

"The song sounds sweet" → ka ma na ta

So, the code is: ka ma ta pa

Hence, the correct answer is "Option 4".

The logic followed here is:

'ABCDE' is coded as 'EDCBA'

ABCDE → Reverse order → EDCBA

'FGHIJ' is coded as 'JIHGF'

FGHIJ → Reverse order → JIHGF

And,

'KLMNO' is coded as 'ONMLK'

KLMNO → Reverse order → ONMLK

Similarly,

'PQRST' is coded as

PQRST → Reverse order → TSRQP 

Hence, the correct answer is "Option 1".

The logic followed here is:

Logic: a $ b = (a − b) × b

Given:

9 $ 3 = 18

→ (9 − 3) × 3

= 6 × 3

= 18

8 $ 2 = 12

→ (8 − 2) × 2

= 6 × 2

= 12

Now, For 6 $ 4 :

6 $ 4 = (6 − 4) × 4

= 2 × 4

= 8

Hence, the correct answer is "Option 1"$.

Given:

Total solution = 25 L

Sugar : Water = 3 : 2

Total parts = 3 + 2 = 5

Sugar = (3/5) × 25 = 15 L

Water = (2/5) × 25 = 10 L

Now, Sugar : Water = 1 : 1

Sugar is already 15 L, so water must also be 15 L.

Currently water = 10 L

So, Water to be added = 15 − 10 = 5 L

Hence, the correct answer is "Option 2".

Family Chart:

Given: 

1.Ravi is married to Rekha.

2.Rekha's brother is Ramesh.

3.Ramesh's wife is Rina.

4.Rina's son is Raj.

So, Raj is Ravi’s Nephew.

Hence, the correct answer is "Option 1".

Family Chart:

Given: 

1. My mother's father = My maternal grandfather.

2. The only daughter of my maternal grandfather = My mother (since she is his only daughter).

So, the man is Seema’s Brother.

Hence, the correct answer is "Option 3".

BODMAS Table: 

Given condition: Interchange ‘+’ and ‘×’ and 15 & 30

Now, check each option after interchanging:

Option 1) (15 + 2) × 30 = 60

After interchange:

(30 × 2) + 15 = ?

⇒ 60 + 15 = 75 ≠ 60 (False)

Option 2) (30 + 3) × 15 = 40

After interchange:

(15 × 3) + 30 = ?

⇒ 45 + 30 = 75 ≠ 40 (False)

Option 3) (15 + 4) × 30 = 135

After interchange:

(30 × 4) + 15 = ?

⇒ 120 + 15 = 135 = 135 (True)

Option 4) (30 + 1) × 15 = 40

After interchange:

(15 × 1) + 30 = ?

⇒ 15 + 30 = 45 ≠ 40 (False)

Hence, the correct answer is "Option 3".

Given Statement: M > N ≤ O

Now,

Conclusions:

(i) M > O → False (From M > N and N ≤ O, no definite relation between M and O)

(ii) M ≥ O → False (Again, no definite relation between M and O can be established)

Here, Neither conclusion I nor II is true.

Hence, the correct answer is "Option 4".

BODMAS Table: 

Given equation: 20 + 5 × 2 - 10 = ?

Now, if ‘+’ means ‘×’, ‘×’ means ‘-’, and ‘-’ means ‘÷’, then:

⇒ 20 × 5 - 2 ÷ 10 = ?

⇒ 100 - 2 ÷ 10 = ?

⇒ 100 - 0.2 = ?

⇒ 99.8

Hence, the correct answer is "Option 4".

According to the question:

Let, the unit place digit be: "x".

Let, the tens place digit be: "y".

Therefore, the number will be:

10y + x.

According to the question, this two-digit number is 4 times  the sum of digits.

→ 4(x + y) = 10y + x.

→ 4x + 4y = 10y + x.

→ 3x = 6y.

→ x = (2)y ----(1).

Now, the new number is 18 more than the original if the digits are reversed.

→ 10y + x = 10x + y + 18

→ 9y - 18 = 9x

Putting the value of "x" from the equation (1)

→ 9y - 18 = 9(2)y

→ 9y - 18 = 18y

→ 9y = 18

→ y = 2

Putting the value of "y" in equation (1).

→ x = (2) × 2

→ x = 4

As the tense digit is 2 and one digit is 4.

The number is "24".

Hence, the correct answer is "Option 1".