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Unit 5 · Mathematical Reasoning and Aptitude Paper 1 · 1 October 2020 Morning

The product of the ages of Sagun and Srishti is 240. If twice the age of Srishti is more than Sagun's age by 4 years, then what is Srishti's age?सगुन और सृष्टि की आयु का गुणनफल 240 है। यदि सृष्टि की आयु का दोगुना, सगुन की आयु से 4 वर्ष अधिक है, तो सृष्टि की आयु क्या है?

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Correct answer: B. 12

Explanation

Let Srishti = x, so Sagun = 2x − 4. Then x(2x − 4) = 240 → x² − 2x − 120 = 0 → (x − 12)(x + 10) = 0 → x = 12. Check: Sagun = 20, and 12 × 20 = 240.माना सृष्टि = x, तो सगुन = 2x − 4। तब x(2x − 4) = 240 → x² − 2x − 120 = 0 → (x − 12)(x + 10) = 0 → x = 12। जाँच: सगुन = 20, और 12 × 20 = 240।

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