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=y4
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(y4)
y=2y8
8=y so y=8
Now, sub this back into the 1st equation
x=y4=84=4
so the number is yx = 84.
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