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ikadub [295]
3 years ago
5

There are 21 students in a class. The ratio of the number of boys to the number of girls is 4:3. How many girls are in the class

?
Mathematics
2 answers:
ZanzabumX [31]3 years ago
8 0

Answer:

Step-by-step explanation:

4:3 total is 7

8:6 total is 14

12:9 total is 21

So there are 9 girls.

k0ka [10]3 years ago
4 0

Answer: 9

Step-by-step explanation:

Given : There are 21 students in a class.

It is given that the ratio of the number of boys to the number of girls is 4:3.

Let 4x be the number of boys and 3x be the number of girls in class.

According to the question , we have

3x+4x=21\\\\\Rightarrow\ 7x=21\\\\\Rightarrow\ x=\dfrac{21}{7}=3

Now, the number of girls in class = 3x= 3(3)=9

Hence, there are 9 girls in class.

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zepelin [54]
Original price is $150 so you times 150 by 0.40
150 x 0.40 = 60
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150 - 60 = 90
So the answer is $90
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3 years ago
Simplify the following? (x^5)^4​
Elis [28]
X^20 i hope this helps
8 0
3 years ago
The ages of undergraduate students in a state
Elan Coil [88]

The percent of students that are aged 19 years or more is determined as 84%.

<h3>One standard deviation below the mean</h3>

In a normal distribution curve 1 standard deviation below the mean is defined as follows;

  • 1 std below mean : M - d = 16%

M - d = 20.6 yrs - 1.3 yrs = 19.3 years ≈ 19 years

19 years or more will occur at (M - d) + (M) + (M + 2d) = 100% - (M - d)

                                                                                       = 100% - 16%

                                                                                       = 84%

Thus, the percent of students that are aged 19 years or more is determined as 84%.

Learn more about normal distribution here: brainly.com/question/4079902

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7 0
2 years ago
Directions: Solve each equation. Show<br> -26 = -9x + 10<br><br> What is the answer?
Ymorist [56]

Answer:

-26= -9x + 10

-26 - 10= -9x

-36=-9x

-36:(-9)=x

4=x

Step-by-step explanation:

1. you pass +10 to the left in minus

2. you resolve what you've got on the left

then you pass the multiplying -9 to the left dividing

4 0
3 years ago
Which represents the solution(s) of the graphed system of equations, y = –x2 + x + 2 and y = –x + 3? (1, 2) (1, 2) and (0, 3) (–
max2010maxim [7]
Y = -x^2 + x + 2
y = -x + 3

-x + 3 = -x^2 + x + 2
x^2 - x - 2 - x + 3 = 0
x^2 -2x + 1 = 0
(x - 1)(x - 1) = 0

x - 1 = 0      y = -x + 3
x = 1           y = -1 + 3
                   y = 2

solutions are : (1,2) , (1,2)


5 0
3 years ago
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