word problem

the tens digits of a certain two digit number exceeds the units digit by 4 and 4 less than trice the units digit. find the two digit number
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1 Answer

The number can be represented by 10a+b where a is the tens digit and b the ones.

a=b+4=3b-4. So b+4=3b-4, so 2b=8, b=4 and a=8. The number is 84.
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