1.

a number consist of two digits.yhe digits in tens place is two times of digit in unit place.if 36 is subtracted from number digits are reversed.

Answer» let \: the \: digit \: in \: ones \: place \: be \: x \\ and \: tens \: place \: be \: y \\ therefore \: the \: number \: is \: (10y + x) \\ atq \: y = 2x......(1) \\ and \: (10y + x) - 36 = 10x + y \\ 9y - 9x = 36.....(2) \\ putting \: value \: of \: y \: in \: eq \: (2) \: we \: get \\ 18x - 9x = 36 \\ 9x = 36 \\ x = 4 \\ therefore \: y \: = 2(4) = 8 \\ so \: the \: number \: is \: (10y + x) = 10(8) + 4 = 84
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