The sum of the digits of …
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Hans Raj 6 years, 6 months ago
let no be xy
x+y=12 ....... i
10y+x - 10x-y = 18
9y - 9x = 18...... ii
from i and ii
9(12 - x) - 9x = 18
108 - 9x - 9x = 18
-18x = - 90
x=5
y=7
two digit no is 57
check ur answer 5+7=12 , 75 - 57 = 18 .......... Great , ........... r u happy or overjoyed tell me
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