温老师买回80分面值和200分面值的邮票共30张,一共花去42元.温老师买80分和200分的邮票各多少张?数学题,求好心

Good afternoon. New teacher. I come from the Department of art and design interior2class000.My hometown is in Huazhou, guangdong. Because of our hometown specialty fruit so I also eat fruit big longan, litchi banana... There are 6 people in my family of 4 sisters and I is the largest so the pressure is a little bit big. I usually like to read a book on the sport I like badminton.. Love food is egg tofu and vegetables. I hope that in the next few years the university to learn more knowledge to know more friends have a rich and colorful life of the university.This is my thanks!