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If (l/3) = (m/9) = (n/21), then lmn/[(l + m + n) × m2] is?

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If (l/3) = (m/9) = (n/21), then lmn/[(l + m + n) × m2] is?
1. 7/33
2. 8/9
3. 7/9
4. 5/9
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Correct Answer - Option 1 : 7/33

Given

(l/3) = (m/9) = (n/21)

Calculation

l = 3k, m = 9k and n = 21k

⇒ 3k × 9k × 21k/(3k + 9k + 21k) × (9k)2

⇒ 567k3/(33k) × 81k2

⇒ 7/33

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