question no. 13 plz guys tell us
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Answered by
0
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
Answered by
0
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
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