Question

The two digit number having the unit digit $x+5$ and ten's digit $x-5$ is _______.

• A. $11x+55$
• B. $11x-45$
• C. $9x-55$
• D. $2x+10$

Answer 1

Answer: (B)

$11x-45$

In a two digit number,
The unit digit $=x+5$
Ten's digit $=x-5$
$\therefore$ The number
$=1(x+5)+10(x-5)$
$=x+5+10x-50$
$=11x-45$.