Question

i have lots of trouble solving questions like these is there a special way thx

Answer 1

This needs to be tackled systematically.

U are told the numbers are in (1,2,3,4,5,6,7,8,9).

And u r told that (a+d+1, b+e+1, c+f) each add up to exactly 10 (0 carry 1).

So c+f has to be (1+9,2+8,3+7,4+6) etc..

And u can do similar for other pairs.

Finally u can use information that the 2 numbers add to exactly 1000.

Answer 2

k thx