Question 380345
M-magazine
B-bill
L-letter
A-ad
.
.

{{{M+B+L+A=19}}}
.
.
.
{{{M=L}}}
{{{B=L+3}}}
{{{A=B+5=L+3+5=L+8}}}
Substituting in the first equation,
{{{L+(L+3)+L+L+8=19}}}
{{{4L+11=19}}}
{{{4L=8}}}
{{{L=2}}}
Then,
{{{M=2}}}
{{{B=2+3=5}}}
{{{A=5+5=10}}}