[banker]

$\frac{0.015}{0.004} = \frac{15}{4} $

$ = 3 + \frac{3}{4}$

$= 3 + \frac{1}{\frac{4}{3}}$

$= 3 + \frac{1}{1+ \frac{1}{3}}$

$A+B+C+D = 3+1+1+3 = 8$

$A+B+C \color{red}{-} D = 3+1+1 \color{red}{-} 3 = \color{red}{2} $