Answer:
120 liters of 60% alcohol solution is needed
Step-by-step explanation:
Let's assume
x liters of 60% alcohol solution is added
so, we get solution as


we are given
40 liters of a 20% alcohol solution is



so, total alcohol solution is

now, we can find total solutions
total solutions is

now, it is making 50% solution
so, we get

now, we can solve for x




So,
120 liters of 60% alcohol solution is needed
No one can tell you the answer to this. You need to provide us with a equation which we can solve.
The ratio can be determined as,

Thus, the requried ratio is 7:12.
Answer:
2.5 hours <u>or</u> 2 hours and 30 minutes
Step-by-step explanation:
130 / 52 = 2.5