Answer:check the pic
Step-by-step explanation:
Answer:
2 gallons of pure alcohol
Let x represent the number of gallons of pure alcohol needed, and create an equation:
4(0.25) + x(1) = (x + 4)0.5
1 + x = 0.5x + 2
x = 0.5x + 1
0.5x = 1
x = 2
So, 2 gallons of pure alcohol should be added.
you have a 58%(rounded) chance against picking a prime number at random
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