Discussion

Explanation:

Since 2a3 is the highest number in the new sequence, the sequence of 5 even numbers starting with the lowest, when expressed (in terms of a3) is
(2a3 - 8), (2a3 - 6), (2a3 - 4), (2a3 - 2), 2a3 

Sum of these 5 numbers = 450

⇒ 2a- 8 + 2a- 6 + 2a- 4 + 2a- 2 + 2a3 = 450
⇒ 10a3 – 20 = 450
⇒ 10a3 = 470
a= 47

Now in the original sequence of 5 odd numbers, a3 = 47 
a5 = a+ 4
a= 47 + 4 = 51

Hence, 51.

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