Out of three given number the first number is twice the

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Out of three given number the first number is twice the second and thrice number is 154 then what is the difference between the first and third number ?

1. 126
2. 42
3. 168
4. 52

Correct Option: C

Let the third number = N
Then the first number = 3N
And second number = 3N/2
According to the question [N + 3N + 3N/2] / 3=154
⇒ (2N +6N +3N) / 6 = 154
∴ N = (154 x 6) / 11 = 84
∴ Required difference = 3N - N = 2N
= 2 x 84 = 168