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vfiekz [6]
3 years ago
10

How many liters of 30% alcohol solution must be mixed with 40 liters of a 70% solution to get a 40% solution?

Mathematics
1 answer:
kondor19780726 [428]3 years ago
4 0
We have 40 liters of 70% alcohol
How much 30% must we add to make 40% alcohol?
.70 * 40 + .30x = .40 * (40 + x)
28 + .30x = 16 + .40x

12 = .10 x
x = 120 liters of 30% must be added
*********************************************
Double-Check
40 ltrs .70 alcohol = 28 liters alcohol 12 water
120 ltrs. .30 alcohol = 36 ltrs. alcohol 84 water

adding both we get
64 ltrs. alcohol 96 ltrs. water 
160 liters total
64 / 160 = .40 or 40% alcohol solution 
correct!!!
Source:1728.com/mixture.htm

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Trica made a 56% on her science test. If she got 14 problems correct, how many qestions were on the test
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Answer:25

Step-by-step explanation: 14/.56

3 0
4 years ago
The area was of a rectangle is 6384 square yards .If the width of the rectangle is 7 yards what is the length of the rectangle
aev [14]

Answer:

The Length of Rectangle is 906.851743 yards

Step-by-step explanation:

Given :

The area of a rectangle is 6384 square yards .

The width of the rectangle is 7 yards.

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Solution :

The formula of area of rectangle is :

Area of Rectangle = Length * Width

Since we are given that area of a rectangle is 6384 square yards and width of the rectangle is 7 yards . so putting these values in formula we get:

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7 0
3 years ago
Why a square must be a rectangle, but a rectangle does not have to be a square?
Dmitry_Shevchenko [17]
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7 0
4 years ago
Mr. Haynes orders carry out from Outback. The cost of his order is $82.37. If Mr. Haynes would like to add a 10% tip, what will
Mrac [35]

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6 0
3 years ago
Which relation is a function? Please help I need asap
Alisiya [41]

Answer:

Probably A, can't see all of D

Step-by-step explanation:

I can't see the last of D, so I will still try.

A function means that each x only goes to one y, but each y can have multiple xs going to it.  If that's hard to understand, on the table, if you have two of the same xs on the x side, they HAVE to have the same y on the y side.  Simple as that.  

Right away, A looks right since it doesn't repeat anything on the x side, it has 4, 5, 6 and 7.  Let's look at the others.

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C repeats -5 and both have a different y, 2 and 3, so not a function

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3 0
3 years ago
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