Question

2sticle de suc si 4sticle de apa costa 18lei.6sticle de suc si 4 de apa costa 38lei

Answer 1

$2a+4b=18$

$6a+4b=38$

$6a+4b-2a-4b=38-18$

$4a=20$

$a=5$

$2*5+4b=18$

$4b=8$

$b=2$