RRB JE practice question
A invests Rs 45,000 in a business for the entire year. B invests Rs 60,000 but withdraws Rs 15,000 after 8 months (continuing with the reduced amount for the remaining 4 months). C invests some amount for the entire year. If the total annual profit is Rs 87,000, out of which A's share is Rs 27,000, find C's investment.
From a RRB JE Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) Rs 45,000
A's capital-months = 45,000 × 12 = 5,40,000
B's capital-months = (60,000 × 8) + (45,000 × 4) = 4,80,000 + 1,80,000 = 6,60,000
Let C's investment = Y for 12 months: capital-months = 12Y
A's share fraction = A's capital-months / total capital-months = 27,000/87,000 = 9/29
5,40,000/(5,40,000 + 6,60,000 + 12Y) = 9/29
5,40,000 × 29 = 9 × (12,00,000 + 12Y)
1,56,60,000 = 1,08,00,000 + 108Y
108Y = 48,60,000
Y = Rs 45,000.
हिंदी में प्रश्न
A एक व्यापार में पूरे वर्ष के लिए Rs 45,000 निवेश करता है। B, Rs 60,000 निवेश करता है लेकिन 8 महीने बाद Rs 15,000 निकाल लेता है (शेष 4 महीनों के लिए घटी हुई राशि के साथ जारी रखता है)। C पूरे वर्ष के लिए कुछ राशि निवेश करता है। यदि वार्षिक कुल लाभ Rs 87,000 है, जिसमें से A का हिस्सा Rs 27,000 है, तो C का निवेश ज्ञात करें।
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (C) Rs 45,000
A का पूंजी-माह = 45,000 × 12 = 5,40,000
B का पूंजी-माह = (60,000 × 8) + (45,000 × 4) = 4,80,000 + 1,80,000 = 6,60,000
मान लीजिए C का निवेश 12 महीनों के लिए Y है: पूंजी-माह = 12Y
A के हिस्से का अंश = A का पूंजी-माह / कुल पूंजी-माह = 27,000/87,000 = 9/29
5,40,000/(5,40,000 + 6,60,000 + 12Y) = 9/29
5,40,000 × 29 = 9 × (12,00,000 + 12Y)
1,56,60,000 = 1,08,00,000 + 108Y
108Y = 48,60,000
Y = Rs 45,000.
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