Question

A number consists of digits whose sum is 9. If 27 is subtracted from the number its digits are reserved.Find the number

Answer 1

Let the unit digit be x
so tens digit is (9-x)
ATQ
10(9-x)+x -27= 10x+(9-x)
90-10x+x - 27 = 10x +9-x
63-9x = 9x +9
18x = 54
x= 3

so the no. is 63

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