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The digit in the units column of the number 7157 is 7.
The units digit of a two digit number exceeds twice the tens digit by 1. Find the number if the sum of its digits is 10.
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"If the units digit and the hundreds digit of the number 513 were reversed..." 315 'find the sum of the original number and the new number." 513+315=828
It is the digit 7 that is in the ones or units place