Posted by **Dee** on Monday, February 18, 2013 at 2:04am.

A two digit number has the property that the units digit is 4 less than the tens digit and the tens digit is twice the units digit. What is the number?

- math -
**BAD**, Monday, February 18, 2013 at 2:52am
84

- math -
**Jeff**, Monday, February 18, 2013 at 3:02am
BAD is correct. It is 84. If you would like to use algebra, do the following:

x:= Unit Digit Number

y:= Tens Digit Number

The units digit is 4 less than the tens digit number so We know that

x=y-4

The tens digit is twice the units digit so we know that

y=2x

Now we can take the 1st equation and substitue into the second equation, then solve for Y.

y=2x

y=2(y-4)

y=2y-8

8=y so y=8

Now, sub this back into the 1st equation

x=y-4=8-4=4

so the number is yx = 84.

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