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blondinia [14]
3 years ago
14

the ratio of boys to girls in the grade 3 classes at domino primary school is 3:5 . if there are 280 grade 3 learners, how many

are girls?​
Mathematics
1 answer:
melamori03 [73]3 years ago
7 0

9514 1404 393

Answer:

  175

Step-by-step explanation:

Let g represent the number of girls. Then 280-g is the number of boys. Their ratio is ...

  boys/girls = 3/5 = (280-g)/g

Clearing fractions gives ...

  3g = 5(280 -g)

  8g = 1400 . . . . eliminate parentheses, add 5g

  g = 175 . . . . . . . divide by 8

There are 175 girls in the grade 3 classes at Domino Primary School.

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A housepainter mixed 5 gal of blue paint with every 9 gal of yellow paint in order to make a green paint. What is
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Answer:

A

Step-by-step explanation:

5:9 is the original ratio.

we know that anything times 5 would have the ones place of either 5 or 0 so we can eliminate c and d. Then we test out the other two choices.

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A is correct.

15/5=3

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Option B is incorrect.

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3 years ago
Use the graph of the function. Determine Over what interval(s) the function is positive or negative.
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Answer:

I can't see the numbers well, but the graph is decreasing from (-inf, minimum) and increasing from (minimum, inf).  The minimum  is the vertex.  Hope this helps!

Step-by-step explanation:

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Which equation is equivalent to ry (3x +2y) = 4?
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Which of the following operations is true regarding relative frequency distributions? Multiple choice question. No two classes c
pshichka [43]

Answer:

The relative frequency is found by dividing the class frequencies by the total number of observations

Step-by-step explanation:

Relative frequency measures how often a value appears relative to the sum of the total values.

An example of how relative frequency is calculated

Here are the scores and frequency of students in a maths test

Scores (classes)              Frequency                Relative frequency

0 - 20                                10                               10 / 50 = 0.2

21 - 40                               15                               15 / 50 = 0.3

41 - 60                               10                               10 / 50 = 0.2

61 - 80                                5                                 5 / 50  = 0.1

81 - 100                             <u> 10</u>                                10 / 50 = <u>0.2</u>

                                          50                                               1

From the above example, it can be seen that :

  1. two or more classes  can have the same relative frequency
  2. The relative frequency is found by dividing the class frequencies by the total number of observations.
  3. The sum of the relative frequencies must be equal to one
  4. The sum of the frequencies and not the relative frequencies is equal to the number of observations.

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