Question

please solve question no . 7,8,9.
plez solve it .

Answer 1

Answer 7-
Let the no on the tens place be- x
_____________ones_______-y
Actual number-> 10x+y ------(1)
According to the question=>x+y=9
x=9-y------(2)
=>(10x+y)-9=10y+x
=>[10(9-y)+y]-9=10y+9-y
=>90-10y+y-9=10y+9-y
=>90-9y-9y=18
=>-18y=-72
=>y=-72/-18
=>y=4
From eq (2)
=>x=9-y
=>x=5

From equation (1)
Real no=>10x+y
10*5+4
54 answer