Question

in a 2digit number ten digit is twice the units digit when the number is decreased by 36. The digits are reversed. Find the two digits number.​

Answer 1

Answer:

$the \: original \: number \: is \: \: \: 84.$

Step-by-step explanation:

$let \: the \: unit \: digit \: is \: x \\ \\ let \: the \: tens \: digit \: is \: y \\ \\ y = 2x \\ \\ 10y + x - 36 = 10x + y \\ \\ 9y - 9x = 36 \\ \\ y - x= 4 \\ \\ \\ solving \: these \\ \\ we \: get \\ \\ \\ \\ x = 4 \\ \\ y = 8 \\ \\ the \: original \: number \: is \: \: \: 84.$