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Greater than 55.

Is it 56 ? [ 5 + 6 = 11 ]. No.

Is it 57 ? [ 5 + 7 = 12 ]. No.

Is it 58 ? [ 5 + 8 = 13 ]. Yay !

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Another way:

Greater than 55 and less than 60. The number is either 56, 57, 58, or 59.

The first digit has to be '5', and both digits have to add up to 13.

The second digit is [ 13 - 5 = 8 ].

So the number is 58.

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15y ago

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