Question

question no. 13 plz guys tell us​

Answer 1

Answer:

so no=39

Step-by-step explanation:

let the digits are x and 12-x

then no=10x+12-x=9x+12

THe reverse of No

=10(12-x)+x=120-9x

given

120-9x=9x+12+54

18x=120-12-54

18x=120-66=54

x=3

so 10's digits=3

one's digit=12-3=9

so no=39

Answer 2

Answer:

x+y=12

10y+x=54+10x+y 9x-9y=-54 9 (x-y)= -54 x-y= -6 x+y=12 solve substitution or .......... find x and y and put in 10x+y you got a number