Question

Type A coffee costs Bill 4.30

Answer 1

4.30A+5.70B=855.40
A+B=168

A=168-B
substitute

4.30(168-B)+5.70B=855.40
4.30*168-4.30B+5.70B=855.40
1.40B =855-4.30*168
1.40B=132.60
B=132.60/1.40= 94.7 pounds≈95 pouds