I believe it is 21 and all so if u are having trouble in mathematics a good app to have is Pappa math algebraic calculator
Answer:
2s+5p=40
Step-by-step explanation:
s=sodas
p=popcorn
you can plug in 0 for s or for p to see how many of the other she can get (if you plug in 0 for s you see she can get 8 popcorns, if you plug in 0 for popcorn, she can buy 20 sodas)
300 milliliters in each container because 2.1 liters is 2100 milliliters and 2100/7 is 300