SBI PO Prelims practice question
A set of 6 consecutive natural numbers starts from 50, and another set of 14 consecutive natural numbers starts from 103. If the two sets are merged into one group of 20 numbers, find their average.
From a SBI PO Prelims Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (B) 92.4
First set: 50 to 55 (6 numbers), sum = 6×(50+55)/2 = 315. Second set: 103 to 116 (14 numbers), sum = 14×(103+116)/2 = 1533. Combined sum = 1848, total count = 20. Average = 1848/20 = 92.4.
हिंदी में प्रश्न
50 से शुरू होने वाली 6 लगातार प्राकृतिक संख्याओं का एक समूह और 103 से शुरू होने वाली 14 लगातार प्राकृतिक संख्याओं का दूसरा समूह है। यदि दोनों समूहों को मिलाकर 20 संख्याओं का एक समूह बनाया जाए, तो उनका औसत ज्ञात कीजिए।
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सही उत्तर: (B) 92.4
पहला समूह: 50 से 55 (6 संख्याएँ), योग = 6×(50+55)/2 = 315। दूसरा समूह: 103 से 116 (14 संख्याएँ), योग = 14×(103+116)/2 = 1533। कुल योग = 1848, कुल संख्याएँ = 20। औसत = 1848/20 = 92.4।
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