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1. A two digit number is obtained by either multiplying the sum of the digits by 8 & adding 1, or by multiplying the difference of the digits by 13 & adding 2. Find the number. How many such numbers are there?
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Answered by
4
Let ten's digit = z and unit digit = y.
10x + y = 8(x+y) + 1
&
10x + y = 13(x-y)+2
solve
number 41
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