5. यदि 25a + 25b = 115 हो, तो a तथा b का औसत कितना
(बैंक पी०ओ० परीक्षा, 2009)
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Answer:
25a,+25b=115
5a+5b=23
2(5a+5b)/2=115
2×5(a+b)/2=115
(a+b)/2=115/10=11.5
average =11.5
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