Delhi Police Constable practice question
Yusuf Stores mixes ordinary mustard oil costing Rs 76 per litre with some premium mustard oil in the ratio 7:4 (cheaper : dearer) and sells the mixture at Rs 96 per litre, incurring neither profit nor loss. Find the cost price of the premium mustard oil per litre.
From a Delhi Police Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) Rs 131
By the rule of alligation, when there is no profit or loss, the mean price equals the weighted average of the two prices: Mean price = (r1 x Pc + r2 x Pd) / (r1 + r2). Here cheaper : dearer = 7:4, cheaper price Pc = Rs 76, mean price = Rs 96. So Rs 96 = (7 x 76 + 4 x Pd) / 11. 11 x 96 = 532 + 4 x Pd => 1056 - 532 = 4 x Pd => Pd = 524 / 4 = Rs 131.
हिंदी में प्रश्न
यूसुफ स्टोर्स साधारण सरसों तेल जिसकी कीमत Rs 76 प्रति लीटर है, को कुछ प्रीमियम सरसों तेल के साथ 7:4 (सस्ता : महँगा) के अनुपात में मिलाता है और मिश्रण को Rs 96 प्रति लीटर में बेचता है, जिसमें न कोई लाभ है न हानि। प्रीमियम सरसों तेल का लागत मूल्य प्रति लीटर ज्ञात कीजिए।
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सही उत्तर: (C) Rs 131
मिश्रण नियम (alligation) के अनुसार, जब न लाभ है न हानि, तो माध्य मूल्य दोनों वस्तुओं के मूल्यों का भारित औसत होता है: माध्य मूल्य = (r1×Pc + r2×Pd) / (r1+r2)। यहाँ सस्ता : महँगा = 7:4, सस्ती वस्तु का मूल्य Pc = Rs 76, माध्य मूल्य = Rs 96। अतः Rs 96 = (7 × 76 + 4 × Pd) / 11। 11 × 96 = 532 + 4 × Pd ⇒ 1056 − 532 = 4 × Pd ⇒ Pd = 524 / 4 = Rs 131।
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