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दो अंको वाली संख्याओ का औसत 10 है । यदि एक संख्यां के अंको को बदल दिया जाता है, औसत `3.6` रन बढ़ जाता है । दो अंको वाली संख्या के अंको का अंतर ज्ञात करे ?A. 4B. 3C. 2D. 5 |
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Answer» Correct Answer - A According to the question let as consider by mistake he writes `10^(th)` number with its digits interchanged `therefore (10x+y-(10y+x))/10=3.6` `therefore` In these remaining nine numbers are same and they cancel out `(10x+y-10y-x)/10=3.6` 9x-9y=36 x-y =4 |
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