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Write a 2-digit number ab and the number...

Write a 2-digit number ab and the number obtained by reversing its digits i.e., ba. Find their sum. Let the sum be a 3-digit number dad i.e, `ab+ba= dad`
`(10a +b) + (10b+a)= dad`
`11(a+b)= dad`
The sum a+b can not exceed 18(Why?)
Is dad a multiple of 11 ?
Is dad less than 198?
Write all the 3-digit numbers which are multiples of 11 upto 198. Find the value of a and d.

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