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25 व्यक्तियो का औसत वजन 1 kg बढ़ जाता है , जब 1 व्यक्ति जिसका वजन 60kg है, को 1 अन्य व्यक्ति प्रतिस्थापित करता है । नए व्यक्ति का वजन ज्ञात करे :
A. 50 kg
B. 61 kg
C. 86 kg
D. 85 kg

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Correct Answer - D
माना की 25 व्यक्तियो का वजन = 25x kg and नया व्यक्तियो का वजन = y kg
According to the question ,
25x-60+y=25(x+1)
25x-60+y=25x+25
y=85 kg

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