destineepreuss4472
17.12.2020 •
Mathematics
A gas station attendant is making 1000 gallons of antifreeze that is 48% alcohol. He has some antifreeze that is 40% alcohol and some that is 60% alcohol. How much of each type of antifreeze should he use?
(x = amount of 40% alcohol antifreeze and y = amount of 60% alcohol antifreeze)
He uses
gallons of 40% and
gallons of 60% to make 1000 gallons of 48% alcohol antifreeze.
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Ответ:
Total number of marbles in the bag is 3 + 4 = 7.The problem asks for the probability of (RR) or (BB).It's worthy to note we are replacing the balls after each draw, which means we always have 7 to draw fromSince each draw is independent, we take the product of each event for the total event probability.
P(RR) = 3/7 * 3/7 = 9/49
P(BB) = 4/7 * 4/7 = 16/49
We want to know P(RR) + P(BB)
P(RR) + P(BB) = 9/49 + 16/49 = 25/49