Question : The average of five consecutive odd numbers is 27. What is the product of the first and the last number?
Option 1: 621
Option 2: 667
Option 3: 713
Option 4: 725
Correct Answer: 713
Solution :
Since the average of 5 consecutive odd numbers will be its 3
rd
term. So, find 1
st
term by subtracting 4 from it and 5
th
term by adding 4.
So, 3rd term =27
Therefore, 1
st
term = 27 - 4 = 23 and 5
th
term = 27 + 4 = 31
So, the product of the first and the last number = 23 × 31 = 713
Hence, the correct answer is 713.
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