Answer:
t=0 Sugar = 0 Kg
t=1min Sugar=0.27 Kg
Step-by-step explanation:
Data
Tank = 2640 L (pure water)
Sol=0.09kg Sugar per liter
Vin = Vout = 3L/min
Sugar in the beginning = ?
if beginning is t = 0min Amount of sugar = 0, this is due to the fact that at the moment of entering the tank the content is only water
, but if beginning is t= 1min then;

4x+7=x-2
-x -x
3x+7=-2
-7 -7
3x=-9
3 3 You divide -9 by 3.
x=-3
Your welcome
What are the answer choices?
Find the total number of students that own more than 2 pets:
5 students own 3
4 students own 4
2 own 5
1 owns 6:
5+4+2+1 = 12 total students own more than 2 pets.
Divide that by total number of students:
12 / 30 = 0.4
0.64 x 100 = 40%
The answer is 40%.