Question

If $10$ be added to four times a certain number, the result is $5$ less than five times the number. Find the number.

Answer 1

Let the number be $x$.

According to the condition,

$4x+10=5x-5$

$\Rightarrow 4x-5x=-5-10$

$\Rightarrow -x=-15$

$\therefore x=15$

Hence, number is $15$