# The sum of the di

Let, the unit’s digit = x

The ten’s digit = 12 – x

The number = 10(12 – x) + x = 120 – 9x

After reversing,

Unit’s digit = 12 – x

Ten’s digit = x

The number after reversing = 10x + 12 – x = 9x + 12

According to problem,

9x + 12 = 120 – 9x + 18

18x = 126

x = 7

The original number,

120 – 9 × 7

57

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