The product of two consecutive odd numbers is 6723. What is the greater number?

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JKSSB SI Official Paper (Held On: 11 Dec 2022 Shift 1)
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  1. 83
  2. 80
  3. 85
  4. 79

Answer (Detailed Solution Below)

Option 1 : 83
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JKSSB SI GK Subject Test
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Detailed Solution

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Given:

The product of two consecutive odd numbers is 6723.

Formula used:

(a + b)(a - b) = a2 - b2

Calculation:

Let the smaller number be 2x - 1 and the greater number be 2x + 1.

(2x - 1)(2x + 1) = 6723

⇒ (2x)2 - 12 = 6723

⇒ 4x2 - 1 = 6723

⇒ 4x2 = 6724

⇒ x2 = 6724 / 4

⇒ x2 = 1681

⇒ x = √1681

⇒ x = 41

The greater number (2x + 1):

2x + 1 = 2(41) + 1

⇒ 82 + 1 = 83

∴ The greater number is 83.

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