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Yakvenalex [24]
3 years ago
11

A biology teacher has 15 milliliters of a salt solution that is 65% salt. How many milliliters of water must the teacher add to

make a solution that is 25% salt?
Mathematics
1 answer:
My name is Ann [436]3 years ago
7 0
Assuming that water has 0% salt and that the amount of water added is x ml;

(15+x)*25 = (15+0)*65 = 975
375+25x = 975
25x = 975-375 = 600
x = 600/25 = 24 ml

The teacher must add 24 ml of water.
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jeka94

Answer:

the answer is x = 7

Step-by-step explanation:

1) replace the x with 7

2) 7 + 16 = 23

3) 4(7) = 28

4) 28 - 5 = 23

they're both equal as perpendicular angles should be!

7 0
3 years ago
Find the area to the nearest square foot of the shaded region below, consisting of a square with a circle cut out of it. Use 3.1
NeTakaya

Answer:

22 square feet

Step-by-step explanation:

Area of shaded region = Area of square - Area of circle. The diameter of the circle is also the length of the side of the square as the circumference of the circle is on the circumference of the square.

Area of circle = 3.14 × r × r

r = 10 ÷ 2

= 5

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= 78.5

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Area of square = 10 × 10

= 100

Area of shaded region = Square - Circle

= 100 - 78.5

= 21.5

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I hope this helps :)

7 0
3 years ago
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Nady [450]

Answer:

The wrong in Rafael reason is that 3/6 = 4/8 = 1/2 pizza

Step-by-step explanation:

* <em>Lets explain how to solve the problem</em>

- When we have a quantity we can divided it to many equivalent

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- Equivalent fractions means fractions equal each other

- We can find the equivalent fraction by multiply or divide the two

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- Ex: We can divide a circle into two equal parts each part is 1/2 the

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- Then we can divide the circle by 2 parts with many equivalent fractions

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* <em>Lets solve the problem</em>

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∵ The half of 6 is 3/6

∵ The half of 8 is 4/8

- <em>Lets simplify the two fraction</em>

∵ 3/6 = 1/2 by dividing up and down by 3

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∴ There is no difference between the two orders, both of them

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∴ The wrong in Rafael reason is that 3/6 = 4/8 = 1/2 pizza

5 0
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Answer:

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