Answer:

Step-by-step explanation:
We can write them both like functions like this


Where
x=input
A=Output A
B=Output B
We want the output of A 3 times the output of B this can be written like this:

we replace with the functions

we solve for x

The output that makes the out put of A 3 times teh output of B is 
Two out of four can be represented as:
2/4
OR
1/2
The solution to the equations is x=20 and y=40
Step-by-step explanation:
Let,
Small tier = x
Medium tier = y
According to given statement;
1.The situation with a system of equations.
3x+y = 100 Eqn 1
3x+2y=140 Eqn 2
2. Solving the System of equations;

The solution to the equations is x=20 and y=40
Keywords: Linear equations, subtraction
Learn more about linear equations at:
#LearnwithBrainly
Based on the given answers, do you possibly mean 100 instead of 102?
If so, you would move the decimal point of 8.4 two places to the right, meaning the answer would be letter D. 840.