Question

In a two digit number the digit at the unit's place is four times the digit in the ten's place and the sum of the digits is equal to 10 What is the number?

• A. 14
• B. 44
• C. 82
• D. 28

Answer 1

The correct option is D 28

Let the digit at ten's place $=x$
Then digit at unit's place $=4x$
Sum of digit $=10$
$\Rightarrow x+4x=10\Rightarrow 5x=10\Rightarrow x=2$
$\therefore$ The number $=10\times x+4x$
$=10\times 2+4\times 2=20+8=28$