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s2008m [1.1K]
2 years ago
11

Don’t answer if you don’t know, plz. Thanks.

Mathematics
1 answer:
horrorfan [7]2 years ago
7 0
B. I did this test too.
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A chemist has 10% and 40% solutions of acid available. How many liters of each solution should be mixed to obtain 120 liters of
kaheart [24]

Answer:

100 liters of  10% solution is used and 20 liters of  40% solution is used

Step-by-step explanation:

Let "X" amount of 10% solution is used. Then the amount of 40% solution used is equal to 120-X

Now

10% of X + 40% of (120-X) = 15% of 120

On solving the above equation, we get

0.1 X + 0.4 (120-X) = 0.15 *120\\0.1 X + 48 -0.4X = 18\\0.3 X = 30\\X = 100liters

Amount of 40% solution used  = 120 -X = 120-100 = 20 liters

100 liters of  10% solution is used and 20 liters of  40% solution is used

7 0
2 years ago
A ramp with a constant incline is made to connect a driveway to a front door. At a point 4 feet from the driveway, the height of
Mashcka [7]

Answer:

3 inches up per foot across

Step-by-step explanation:

The rate of change:

( y2 - y1 ) / (x2 - x1) = ( 18 in - 12 in ) / ( 6 ft - 4 ft ) =

= 6 in / 2 ft = 3 in / 1 ft

8 0
3 years ago
How many simple random samples of size 3 can be selected from a population of size 6?
ale4655 [162]
This  would be  6C3

= 6*5*4
----------  =  20 answer
  3*2*1
6 0
3 years ago
On a test, Marcus answered 12 out of the first 15 problems correctly. If this rate continues
Deffense [45]

Answer:

20

Step-by-step explanation:

6 0
2 years ago
Café Noir charges a 1% levy on the bill for trading on Sundays. If the final bill is $55.55, what was the original price, taking
svetoff [14.1K]
As I guess I think its 5
7 0
3 years ago
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