RRB NTPC CBT-1 previous year question
A local library purchased several biography books and mystery novels for their new collection. The library spent exactly ₹4,800 on biography books and ₹4,800 on mystery novels. Each biography book costs ₹40 more than a mystery novel. The library was able to buy 10 more mystery novels than biography books. Find the number of biography books purchased.
Asked in RRB NTPC 2026 — 17 June Shift 1 · Quantitative Aptitude
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Correct answer: (D) 30
Let mystery-novel price = p, biography price = p+40. Given 4800/p - 4800/(p+40) = 10, solving gives p = 120, so biography price = 160 and biography count = 4800/160 = 30.
हिंदी में प्रश्न
एक स्थानीय पुस्तकालय अपने नए संग्रह के लिए कई जीवनी पुस्तकें और रहस्य उपन्यास खरीदता है। पुस्तकालय ने जीवनी पुस्तकों पर ठीक ₹4,800 और रहस्य TAU UW ₹4,800 खर्च किए। प्रत्येक. जीवनी पुस्तक की कीमत एक रहस्य उपन्यास से ₹40 अधिक है। पुस्तकालय जीवनी पुस्तकों की तुलना में 10 अधिक रहस्य उपन्यास खरीद पाया। खरीदी Ws जीवनी पुस्तकों की संख्या ज्ञात कोजिए।
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उत्तर और व्याख्या देखें
सही उत्तर: (D) 30
मान लीजिए रहस्य उपन्यास की कीमत p और जीवनी की कीमत p+40 है। 4800/p - 4800/(p+40) = 10 हल करने पर p = 120 मिलता है, अतः जीवनी की कीमत 160 और जीवनी की संख्या = 4800/160 = 30।
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