Question

number has two digits the digit at tens place is four times the digit of unit place if 54 is extracted from the number the digits are reversed find the number​

Answer 1

Let the two digit number be xy.

Given x=4y and if we extract 54 from xy we will get yz.

10x+y-54=10y+x

40y+y-54=10y+4y

27y=54

y=2,x=8.

Thus xy=82