In a two-digit number, the digit in the unit's place is four times the digit in ten's place and the sum of the digits is equal to 10. What is the number?  Choose the correct option.
A) 82 B) 41 C) 14 D) 56 E) 28
Let the ten's digit be x. then, unit's digit = 4x   therefore x + 4x = 10 ==&gt; 5x = 10 ==&gt; x = 2   so ten's digit is 2 and unit's digit is 8, so the number is 28   so the correct answer is option 28) 28
<result>E</result>
In a two-digit number, the digit in the unit's place is four times the digit in ten's place and the sum of the digits is equal to 10. What is the number?