Let the tens digit be x and ones digit be y 10x+y=(No.) x+y=(No.)-9x =(10x+y)-9x 10x+y-((10x+y)-9x)=9x Since the answer would be a multiple of 9, all the numbers that can be divided by 9 would have the same symbol and would be flash on the 'magic' ball.

Let the tens digit be x and ones digit be y

ReplyDelete10x+y=(No.)

x+y=(No.)-9x

=(10x+y)-9x

10x+y-((10x+y)-9x)=9x

Since the answer would be a multiple of 9, all the numbers that can be divided by 9 would have the same symbol and would be flash on the 'magic' ball.

All the possible nanswers have the same symbol.

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