Question

find the number if one third of it added to 5 gives 8​

Answer 1

$x \times \frac{1}{3} + 5 = 8 \\ \\ = > \frac{x + 15}{3} = 8 \\ \\ = > x + 15 = 24 \\ \\ = > x = 24 - 15 = 9$