SOLUTION: the ones digit of a two digit number is twice its tens digit. if the sum of its digits is 12, what is the number?
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Question 665974: the ones digit of a two digit number is twice its tens digit. if the sum of its digits is 12, what is the number?
Answer by ReadingBoosters(3246) (Show Source): You can put this solution on YOUR website!
Establish variables
x = tens place
y = ones place
...
Given
y=2x
x+y=12
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Substitute y into the second equation
x + 2x = 12
3x = 12
as the digit in the tens place.
...
Rearranging y=2x as x = , substitute into the second equation
Multiply the entire equation by 2 to be rid of the fraction.
y + 2y = 24
3y = 24
as the digit in the ones place.
...
The number is
...
Check
.....................
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