Respuesta :

luana
[tex]20\$\ for\ 1\ week\\ x\ for\ 6\ weeks\\\\ proportion:\\ 20-1\\x-6\\\\cross\ multiplication\\\\ 20*6=x\\\\ 120=x\\\\ 6\ weeks\ of \ lessons\ cost\ 120\$. [/tex]
[tex]20*6=120 [/tex] 20=$20 per week 6=6 weeks