UP Police Constable practice question
Ramesh mixes Grade-B tea (cost Rs 60 per kg) with Grade-A tea in the ratio 3:4 (cheaper : dearer). The mixture is sold at Rs 168 per kg, giving a profit of 20%. Find the cost price of the Grade-A tea per kg.
From a UP Police Constable Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (A) Rs 200
Step 1: Since the whole mixture is sold at a profit of 20%, the mean COST price of the mixture is Mean CP = SP / (1 + 20/100) = 168 / (120/100) = Rs 140 per kg. Step 2: By alligation, Mean CP = (r1 x Pc + r2 x Pd)/(r1+r2). Here cheaper:dearer = 3:4, Pc = Rs 60. 140 = (3 x 60 + 4 x Pd)/7 => 980 = 180 + 4 x Pd => Pd = 800/4 = Rs 200.
हिंदी में प्रश्न
रमेश ग्रेड-बी चाय (लागत Rs 60 प्रति किग्रा) को ग्रेड-ए चाय के साथ 3:4 (सस्ता : महँगा) के अनुपात में मिलाता है। मिश्रण को Rs 168 प्रति किग्रा में बेचने पर 20% का लाभ होता है। ग्रेड-ए चाय का लागत मूल्य प्रति किग्रा ज्ञात कीजिए।
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सही उत्तर: (A) Rs 200
चरण 1: चूँकि पूरा मिश्रण 20% लाभ पर बेचा जाता है, मिश्रण का माध्य लागत मूल्य (Mean CP) = SP / (1 + 20/100) = 168 / (120/100) = Rs 140 प्रति किग्रा। चरण 2: मिश्रण नियम से, Mean CP = (r1×Pc + r2×Pd)/(r1+r2)। यहाँ सस्ता:महँगा = 3:4, Pc = Rs 60। 140 = (3 × 60 + 4 × Pd)/7 ⇒ 980 = 180 + 4 × Pd ⇒ Pd = 800/4 = Rs 200।
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