Ten's place= y
Original no.= 10y x
Reversed no. = 10x y
A.t.1st.c
x y = 15----(1)
A.t.2nd.c
10y x = 10x y 9
10y x -10x -y = 9
9y - 9x = -1
x - y = -1----(2)
Now,
x y = 15
x- y = -1
__________
2x = 14
___________
x= 7
Put x=7 in --(1)
7 y = 15
y = 15-7
y = 8
10x y
10(7) 8
70 8
78
Written on April 6, 2019, 9:59 a.m.