Question

If the are at
tens place of a two digit number is 2 times the digit at once place if the digits are reversed the number became 18 less than the original number what is the original
number

Answer 1

2X×10 +X -18= 10X+2X

20X+X-10X-2X=18
9X=18
X=2

So the number is 2X×10 +X = 4×10 +2= 42

$42$