Answer:
do you mean PEMDAS?
Step-by-step explanation:
parenthesis, exponents, multiplication, division, addition, and subtraction
you solve in order and go left to right
if you give an equation i can explain it better, but it's basically that
Answer:
90 liters
Step-by-step explanation:
It's given in the question!
Answer:
equivalent to 
Step-by-step explanation:
Given ratio, 
It can be written as 
cancel common factor,
