- 8 : 7
- 9 : 8
- 3 : 2
- 7 : 6
Answer (Detailed Solution Below)
Option 2 : 9 : 8
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माना कि A और B की वर्तमान आयु 6x और 5x है।
प्रश्नानुसार,
(6x – 4)/(5x – 4) = 5/4
⇒ 24x – 16 = 25x – 20
⇒ x = 4
∴ A की वर्तमान आयु = 6x = 6 × 4 = 24
और B की वर्तमान आयु = 5x = 5 × 4 = 20
12 वर्ष बाद, A की आयु होगी = 24 + 12 = 36 वर्ष
और 12 वर्ष बाद, B की आयु होगी = 20 + 12 = 32 वर्ष
∴ अभीष्ट अनुपात = 36 : 32 = 9 : 8
चार वर्ष पहले अनुपात = 5 : 4
वर्तमान आयु अनुपात = 6 : 5
12 वर्ष के बाद आयु का अनुपात = 4 × 3 वर्ष
4 × 3 वर्ष → 1 × 3 इकाई
12 वर्ष बाद अनुपात = (6 + 3) : (5 + 3) = 9 : 8
∴ अभीष्ट अनुपात 9 : 8 है।
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