Answer:
b
Step-by-step explanation:
It holds 27 liters
She's pouring 3 liters at a time
So she needs to the 3 liter container 27/3= 9 times in order to fill her fish tank.
The two equations are

and

the first equation can be solved for x to be

next you can substitute x in the second equation

Distribute 4 to everything in the parentheses

combine like terms:

subtract 28 from both sides of the equation

divide both sides by -1.5

plug this in to the original equation of x+y=7

subtract 4 from both sides.

Final Answer: they bought 3 adult tickets and 4 student tickets
Hope this helps!
The answer is 80, because 8 is in the hundreds place which means 80.
Answer:
900
Step-by-step explanation: