Question

a+b+c=52;b=a+3;c=b-c

Answer 1

$a+b+c=52$

$b=a+3$

$c=b-c\Longrightarrow b=2c$

$2c=a+3\Longrightarrow a=2c-3$

$c+2c+2c-3=52$

$5c=55$

$c=11$

$a=2*11-3=19$

$b=2*11=22$

Answer 2

a+b+c=52     b=a+3   b=2c    a=2c-3   2c-3+2c+c=52   5c=55  c=55/5  c=11  b=22  c=19