Question 87943
The tens digit is four times the units digit and the number is 10 more than nine times the tens digit. Find the number." 
---------------
Comment: Any two digit number can be written as 10t+u where t is the 10's
digit and u is the units digit.
--------------------------
Your Problem:
Let your number be 10t+u
EQUATIONS:
t = 4u
10t+u = 9t+10
--------
Substitute to get:
10(4u)+u = 9(4u)+10
40u+u = 36u+10
5u = 10
u=2
------
Substitute into t=4u to solve for t:
t=4*2=8
--------
The number is 82
=================
Cheers,
Stan H.