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29. A number has two digits whose sum is 6. On adding 18 to the number, its digits areinterchanged. The number is(a) 23(b) 24(c) 26 (d) 25 |
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Answer» number = 10x + yGiven :A number has two digits whose sum is 6.On ADDING 18 to the numberAnswer :x+y = 610x + y +18 = 10y + x(10y + x) - (10x +y) =189y - 9X = 18Y - x = 18/9y - x = 2(x +y) - (y-x) = 6 - 22X = 4 x = 4/2 x = 2x + y = 62+y = 66-2 =yy = 4The number = 10x + y = 10×2 + 4 = 24Hope this will help..... |
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