Question

Specify the number of which is the third of its size is 15

Answer 1

Let the number be x
A/Q
$\frac{1}{3} \times x = \frac{1}{5} \times x+ 16 \\ => \frac{1}{3}x = \frac{x+80}{5} \\ => \frac{x}{3} = \frac{x + 80}{5} \\ => 3x + 240 = 5x \\ => 2x =240 \\ => x = 120$