Question

What must be added to the smallest number formed by using the digits 1,3,5,4,2,7 to get the sum as the greatest number formed by using the digits 2,5,7,8,9,0? Each digit is to be used once only while forming the number.

Answer 1

First of all
1,3,5,4,2,7 rearrange this to smallest no
I.e, 123457
2,5,7,8,9,0 to greatest no
987520
&
Subtract from bigger to smaller
987520-123457
&
Answer is
864063