Kai A.

asked • 05/17/20

Mixed Problem Solving

The units digit of a two-digit number is twice the tens digit. If the digits are reversed, the new number is 18 more than the original number. Find the original number.

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Inactive Tutor answered • 05/18/20

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Step 1: Set two variables: x = the digit in the 10s place, y = the digit in the ones place.

Step 2: Realize that the value of this number is 10x +y. For example, if x is 3 and y is 6, the value is 36


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Step 3: We're told that is we reverse x and y, the value will be 18 more than it was before. That says that 10x+ y +18 = 10y + x. Be sure you understand how I got that equation, if not please ask
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05/18/20

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