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earnstyle [38]
3 years ago
13

A doctor ordered 300 ml of a 10% solution,but the pharmacy only has 5% and 25% solutions. How many millimeters of each solution

should the pharmacist mix to get the prescribed medication for the man?
Mathematics
1 answer:
serg [7]3 years ago
3 0

Answer:


Step-by-step explanation:

(300 * 0.1) = (0.05 * x) + (0.25 * (300 - x))

30 = 0.05x + 75 - 0.25x

-45 = -0.2x

x = 225.

So there would be...

<h2>225 milliliters of 5% solutions</h2><h2>and</h2><h2>75 milliliters of 25% solutions.</h2><h2 /><h2>Feel free to contact me if you have issues or difficulties.</h2>
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If he goes to bed at 9:00 pm, and wakes up at 10:00 am he will have slept 13 hours.
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1 year ago
2. The seventh grade class is putting on a variety show to raise
ladessa [460]

Answer:

67

Step-by-step explanation:

15 x 10 = 150

150 x 6 = 900

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3 years ago
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When babies are born, their lengths are recorded. Maddy is 18 1/2 inches. Her twin Alex, is 20 3/4 inches. How much longer is Ma
Furkat [3]

Answer:

Alex is 2 1/4 inches longer than Maddy

Step-by-step explanation:

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Get a common denominator

20 3/4 - 18  2/4

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7 0
2 years ago
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For a normal distribution,
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Answer:

1.282, -0.5244,...

Step-by-step explanation:

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a) z-score separates the highest 10% from the rest of the scores

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= 30th percentile = -0.5244

c) z-score separates the lowest 40% from the rest of the scores

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d) z-score separates the lowest 20% from the rest of the score

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7 0
2 years ago
Matt and Anna Killian are frequent fliers on​ Fast-n-Go Airlines. They often fly between two cities that are a distance of 1980
Ymorist [56]

Answer:

y (plane speed) 400 miles/hr

x (wind speed)  40 miles/hr

Step-by-step explanation:

going into the wind make the plane flew 5,5 hours to get 1980 miles, implies the real travel speed was

1980 / 5,5 = 360 miles/hours, and at the same time is the result of:  

speed plane (y)  in direction A to B  plus wind speed (x) in direction B to A. Notice opposites direction speed, so we have:

y + (-x) = 360          (1)

The return fly  took 4,5 hours so 1980/4,5 = 440 miles/ hours as the result

Y + x = 440             (2)

We have a two equation with two variables system, It could be solved for any of the procedures. We will use the substitution method.

From equation      (1)        y + (-x) = 360         y  - x = 360      y = 360 + x    (1)

In the second equation    

y + x = 440         then we replace y for its value as function of x

(360 + x ) + x = 440

Solving for x        360 + 2x = 440      or    2x = 440 – 360        

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And replacing the value of x in eq. (1)        y = 360 + 40 = 400

Y (plane speed) = 400 miles /hr

3 0
3 years ago
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