SOLUTION: The tens digit of a two-digit number is half the units digit. If their difference is 4, what is the number?

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Question 205104: The tens digit of a two-digit number is half the units digit. If their difference is 4, what is the number?
Answer by stanbon(48575) About Me  (Show Source):
You can put this solution on YOUR website!
The tens digit of a two-digit number is half the units digit. If their difference is 4, what is the number?
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Let the number be 10t+u.
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Equations:
t = (1/2)u
u -t = 4
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Substitute to solve for "u":
u - (1/2)u = 4
(1/2)u = 4
u = 8
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Substitute to solve for "t":
t = (1/2)u = 4
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Ans: The number is 48
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Cheers,
Stan H.