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Mathematics 12 Online
OpenStudy (anonymous):

The sum of the digits of a two-digit number is seven. When the digits are reversed, the original number is increased by nine. Find the number

OpenStudy (asnaseer):

write the number as follows:\[d_1d_2\]where \(d_1\) is the first digit and \(d_2\) is the second digit. now just form two equations using these and solve to find the answer.

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