3 years ago

19. Which one of the following statements expresses a true proportion?

Mathematics

1 answer:

choli [55]3 years ago

7 0

That would be : 3:5 = 12:20....because 3/5 = 12/20

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Professor Liu gave the same quiz to the students in her morning class and in her afternoon class. The average (arithmetic mean)

natka813 [3]

Answer:

Afternoon class has more students.

Step-by-step explanation:

Let m be the number of students in the morning class and n be the number of students in the afternoon class.

The average score for the students in the morning class was 80, then the sum of their scores is $80m.$

The average score for the students in the afternoon class was 86, then the sum of their scores is $86n.$

The sum of the scores of both classes is

$80m+86n$

and the average score is

$\dfrac{80m+86n}{m+n}$

The average (arithmetic mean) score for the two classes combined was 84, then

$\dfrac{80m+86n}{m+n}=84\\ \\ 80m+86n=84m+84n\\ \\86n-84n=84m-80m\\ \\2n=4m\\ \\n=2m$

This means n is greater, so afternoon class has more students.

7 0

3 years ago

The ratio of boys to girls in the gym class at a local middle school is 3:2. what percent of the gym class is girls

sukhopar [10]

3 boys for every 2 girls
So, the percentage of girls is (2 / 5) x 100 = 40%

5 0

2 years ago

Trick or treat?<br><br> Pls answer ;-;

BARSIC [14]

Treat??

hope this helps lol

3 0

3 years ago

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PLEASEE HELP!! NUMBER 4!!

Illusion [34]

?????????????????????/ us a calculator to add up all the nub.

8 0

3 years ago

A rectangle has a length of (x+10) centimeters and a width of x centimeters. If the perimeter is 32 centimeters, what is the len

I am Lyosha [343]

Given:

Length of rectangle = (x+10) cm

Width of the rectangle = x cm

Perimeter = 32 cm

To find:

The length of the rectangle.

Solution:

We know that,

$Perimeter=2(l+w)$

Where, l is length and w is width.

Substituting the values, we get

$32=2((x+10)+x)$

$32=2(2x+10)$

$32=4x+20$

Subtract 20 from both sides.

$32-20=4x$

$12=4x$

Divide both sides by

$3=x$

So, the length is

$3+10=13$

Therefore, the length of the rectangle is 13 cm.

7 0

3 years ago