The tens digit of a two-digit number is two more than its unit digit. The two-digit number is 7 times the sum of the digits. Find the units digits? Choose the correct answer.
A) 7
B) 2
C) 4
D) 5
E) 1
Explanation:   Let the two-digit number be 10a + b   a = b + 2 --- (1)   10a + b = 7(a + b) =&gt; a = 2b   Substituting a = 2b in equation (1), we get   2b = b + 2 =&gt; b = 2   Hence the units digit is: 2.   Answer:2
<result>B</result>
The tens digit of a two-digit number is two more than its unit digit. The two-digit number is 7 times the sum of the digits. Find the units digits?