Subject: General Aptitude · Chapter: Problems on Numbers · Exam: · Marks: · Difficulty:
In a two-digit number, the digit in the unit's place is four times the digit in ten's place and sum of the digits is equal to 10 . What is the number?
(a)14
(b)41
(c)82
(d)Data inadequate
(e)None of these
Answer
Answer (as printed): E
Explanation
Let the ten's digit be $x$. Then, unit's digit $=4 x$. $\therefore \quad x+4 x=10 \Leftrightarrow 5 x=10 \Leftrightarrow x=2$. So, ten's digit = 2, unit's digit = 8. Hence, the required number is 28.
Explanation as extracted from the printed page; notation may be imperfect.