The average of 3 odd consecutive numbers is 15. What is the sum of first and last numbers? Option 1: 30 Option 2: 20 Option 3: 40 Option 4: 35

Answer: 30. Solution: Let the three consecutive odd numbers be x, x+2, x+4. Their average is (3x+6)/3 = x+2 = 15, so x = 13. The numbers are 13, 15, 17. Sum of first and last = 13 + 17 = 30.

Arithmetic

Central Tendency

Easy

The average of 3 odd consecutive numbers is 15. What is the sum of first and last numbers?

✅ Correct Option: 1

Let the three consecutive odd numbers be $x, x+2, x+4$ . Their average is $\frac{3x+6}{3} = x+2 = 15$ , so $x = 13$ . The numbers are 13, 15, 17. Sum of first and last = $13 + 17 = 30$ .

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The average of 3 odd consecutive numbers is 15. What is the sum of first and last numbers?

Solution

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