1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
vladimir2022 [97]
3 years ago
15

A class of 40 students took a test 20 students had an average score of 65. the other students had an average score of 52. what i

s the average score of the whole class?
At a health club, 28% of the members are men, the rest are women. If the average man is 33 years old, and the average woman is 38 years old, what is the average age of all the members?​
Mathematics
1 answer:
Korolek [52]3 years ago
7 0

Answer:

One: 58.5

Two 36.6

Step-by-step explanation:

One

20 students * 65 = 1300 This is the total score of all 20 students. They may not all get 65, but 1300 is what their average total is.

20 students * 52 = 1040

The total score of all 40 students was 1300 + 1040 = 2340

The average for the entire class was 2340 / 40 = 58.5

Two

This question is done almost the same way.

Supposes the total number of members is 100. That means that 28 of them are men

28 * 33 = 924     This is the total age for the men

100 - 28 = 72        Out of 100, 72 of the people there are women.

72 * 38 = 2736

The total number of years of all of the members is

924 + 2736 = 3660      

The average age of all members is 3660/100 = 36.6

Why did I pick 100 as the total membership? It is because a percentage is number out of 100. Am I allowed to invent things like that? Sure. I'm just using the definition of a percentage.

The average will make it come out the same.

You might be interested in
How much warmer is 12°C than -20°C?
zvonat [6]

To put it simply, 12 degrees C is 12 away from 0 and -20 degrees C is 20 away from 0. Taking these two inputs and adding them together should give you 32. So 12 degrees C is 32 degrees warmer than -20 degrees C

8 0
3 years ago
Read 2 more answers
Factories <br>(a+b)^3+8c^3​
Rom4ik [11]

Answer:

(a + b + 2c)(a² + 2ab + b² - 2ac - 2bc + 4c²)

Step-by-step explanation:

Given

(a + b)³ + 8c³ ← this is a sum of cubes and factors in general as

a³ + b³ = (a + b)(a² - ab + b²)

Thus

(a + b)³ + 8c³

= (a + b)³ + (2c)³

= (a + b + 2c)( (a + b)² - 2c(a + b) + (2c)² )

= (a + b + 2c)(a² + 2ab + b² - 2ac - 2bc + 4c²)

8 0
3 years ago
How do I do number 7 I wasn’t taught this
attashe74 [19]

The perimeter of the polygon will be (2x + 2xy + y + xz). Then the correct option is D.

<h3>What is a polygon?</h3>

The polygon is a 2D geometry that has a finite number of sides. And all the sides of the polygon are straight lines connected to each other side by side.

The figure is given below.

The sides of the polygon are given as x, y, xz, x, xy, and xy.

Then the perimeter of the polygon will be

The perimeter of the polygon is given as the sum of all the sides of the polygon.

Then the perimeter will be

P = x + y + xz + x + xy + xy

P = 2x + y + 2xy + xz

More about the polygon link is given below.

brainly.com/question/17756657

#SPJ1

3 0
2 years ago
Twice the difference of a number and 8 equals 2
bixtya [17]

Answer:

x=16

Step-by-step explanation:

2(x/8)=2

2x / 16=2

   x 16 x 16

2x=32

2x/2= 32/2

x= 16    

6 0
2 years ago
Is perpendicular to ? Explain.
olga2289 [7]
Two lines are perpendicular if and only if the product of their slopes is - 1.

So, you just need to find the slope of each line and find out the product of their slopes.

I will do one example for you.

L1: y = 3x + 5

L2: y = - 3x + 14

L3: y = -x/3 + 14

The slope of a line is the coefficient of the x.

So the slopes are:

L1: slope 3
L2: slope -3
L3: slope -1/3

So now multiply the slopes of each pair of lines:

L1 and L2: 3 * (-3) = - 9 => No, they are not perpendicular

L2 and L3: (-3) * (-1/3) = 1 => No, they are not perpendicular

L1 and L3: (3) *  (-1/3) = -1 => Yes, they are penpendicular.
6 0
3 years ago
Read 2 more answers
Other questions:
  • The following are quality control data for a manufacturing process at Kensport Chemical Company. The data show the temperature i
    6·1 answer
  • If $1600 earned simple interest of $56.24 in 2 months, what was the simple interest rate? The simple interest rate is % (Do not
    6·1 answer
  • Kevin says the line P and m will eventually Intersect is Kevin correct
    7·1 answer
  • A laser tag park charges $15 per person.If Sammy can spend up to $120,how many friends can he invite
    6·2 answers
  • Josie just bought her very first laptop , which shes been saving up for almost a year to buy.For Josie the laptop is most likely
    5·2 answers
  • Jacob has a budget of $29 to buy juice for his team how many whole gallons of juice can he buy
    15·1 answer
  • #1. If someone puts $200 into an account at 8% interest for you when you are born, how much
    6·1 answer
  • It takes billy 1/4 of an hour to bike 3/5 of a mile. What is Billy's pace in miles per hour?
    8·1 answer
  • Evaluate the expression for the given values.<br><br> 2x + (3y + z2)<br> X = 2, y = 3, z = 4
    8·1 answer
  • Reflect the point (a) a-axis, and (b) in the y-axis (-1,0)
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!