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
tester [92]
3 years ago
8

There are 15 boys and 10 girls in a hall, each holding coins in their hand.The mean number of coins for the children is 10 The m

ean number of coins for the boys is 8Work out the mean number of coins for the girls.
Mathematics
1 answer:
DiKsa [7]3 years ago
6 0

Answer:

13 coins

Step-by-step explanation:

There are 25 kids in total.

The fraction of kids that are boys and girls are:

B=\frac{15}{25}=0.6\\B=\frac{10}{25}=0.4

The mean number of coins for all kids is given by:

M=B*M_B+G*M_G

If we are given that M = 10, and MB = 8, then the mean number of coins for the girls is:

10=0.6*8+0.4*M_G\\M_G=\frac{10-4.8}{0.4}\\M_G=13\ coins

The mean number of coins for the girls is 13.

You might be interested in
Which simplified expression represents the area of the
Nana76 [90]
Your answer is............4x3 - 14x + 24 square centimeters
7 0
3 years ago
A bank teller has some stacks of bills. The total value of the bills in each stack
Natali [406]
So since only 20 dollar bills and the other one is a 50
then

so we find some combos that will work
five 20's make 100
we notice that we can only have 20's in multipules of 5 to make 100's becauause 4 20's makes 80 and 3 20's make 60 and 2 20's make40 and none of those add to 50 evenly to make 100's
(probably confusing but I hope you understand if you think about it)

so we have
5 20's =100
10 20's=200
15 20's=300
20
25
30
35
40
45 20's=900
50 20's=1000

so how many multiplules did we have?
10
but wait, if we havve 1000 in all 20's we still need at least one 50 so we subtract 100
900:9
answe ris 9 stacks

answer is 9 stacks or A

3 0
3 years ago
There are 2.54cm in an inch, 12 inches in a foot, and 5,280 feet in a mile.which expression gives the number of centimeters in a
geniusboy [140]

Answer:

(2.54×12) ×5280

Step-by-step explanation:

Since there are 2.54cm in an inch, multiply 2.54 by 12 to find out how many cm there are in a foot. Then you multiply that by 5280

8 0
3 years ago
At the movie theatre, child admission is $5.10 and adult admission is $9.40 . on saturday, 158 tickets were sold for a total sal
Viefleur [7K]
Let children be x
Adult be y
5.10x+9.40y=1184.20 ... 1
x+y=158 ... 2

From 1// 510x+940y=118420 ... 3
From 2// y=158-x ... 4

Sub 4 into 3
510x+940(158-x)= 118420
510x+148520-940x=118420
-430x= -30100
x=70

As we know that children are x, 70 children tickets were sold.

8 0
3 years ago
Noshi ordered a new desk for her office. The desk came in two parts, each shaped like a trapezoid.
Stolb23 [73]
The area of the desk is 39ft.
Hope this helps!!!
5 0
3 years ago
Read 2 more answers
Other questions:
  • How do you round each number to the place value of the underlined digit?
    13·1 answer
  • Conor buys 75 tokens for games at the arcade. The price to play each game is 3 tokens. If Conor has already played x games, whic
    10·1 answer
  • Write a quadratic equation in standard form that has roots of -12 and 2
    6·1 answer
  • What is the missing angle?
    5·2 answers
  • Use square roots to solve the equation x^2 = -64 over the complex numbers.
    13·1 answer
  • Two sections of a class took the same quiz. Section A had 15 students who had a mean score of 80, and Section B had 20 students
    11·1 answer
  • Mr thomas puts up fence posts from one end to another equal distances apart.there are 27 posts the width of each part is 10 cent
    6·1 answer
  • Exit
    7·2 answers
  • If the ratio of paintings to paint brushes is 11:9, what percent of the items are paint brushes
    10·1 answer
  • 3x= <img src="https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D" id="TexFormula1" title="\frac{1}{2}" alt="\frac{1}{2}" align="absmi
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!