If the average of four consecutive odd numbers is 42, find the largest numbers.

Question: If the average of four consecutive odd numbers is 42, find the largest numbers.

Solution:
Let
the first number is x,
then the next three odd numbers would be (x + 2), (x + 4), (x + 6)

ATQ,
{x + (x + 2) + (x + 4) + (x + 6)}/4 = 42
⇒ (4x + 12)/4 = 42
⇒ 4x + 12 = 168
⇒ 4x = 156
∴ x = 39

Largest number would be = 39 + 6 = 45