90 minutes because 20 + 20 + 20 + 20 + 10 = 90
Answer:
- 20
Step-by-step explanation:
Step 1:
0.6r + 3 = 0.1r - 7 Equation
Step 2:
0.5r + 3 = - 7 Subtract 0.1r on both sides
Step 3:
0.5r = - 10 Subtract 3 on both sides
Step 4:
r = - 10 ÷ 0.5 Divide
Answer:
r = - 20
Hope This Helps :)
5/10, 5/9, 5/8, 5/7.
These are all between 5/11 and 5/6.
Let x be the contaminated water and y be the pure water. The system of equations would be
0.75x + 1y = 0.97
x + y = 1
75% = 0.75; 100% = 1.0; and 97% = 0.97
The two waters together made 1 gallon of drinkable water.
