solution please ...
Q18
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Let the ten's digit be x. Then, unit's digit = 2x + 1.
[10x + (2x + 1)] - [{10 (2x + 1) + x} - {10x + (2x + 1)}] = 4
<=> (12x + 1) - (9x + 9) = 1 <=> 3x = 9, x = 4
So, ten's digit = 4 and unit's digit = 9. Hence, original number = 49.
Therefore the product is 36
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