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
11Alexandr11 [23.1K]
3 years ago
11

There are 33 of them altogether and pay £311 in total. How many kids are in the family? Adults pay £15 and kids pay £7

Mathematics
1 answer:
Marrrta [24]3 years ago
4 0

Answer:

Step-by-step explanation

  1. Let x be the number of adults and y the number of kids

We can then write this two equations :

          x+y= 33

          15x+7y= 311

  • let's solve the two eaquations

to do that we should combine them both in a way that help us get rid of one of the variables.

             Let's multiply the first equation by -7 to get rid of y by adding it to thr second equation

             -7x-7y= -231

        now add both equations .

              15x+7y-7x-7y=311-231

    we get :  8x = 80

as you notice y is gone and we get a classic easy equation to solve

                x= 80/8

                   = 10

so the number of adults is 10

let's go back to the first equation ( x+y= 33) and replace x with 10

                10+y= 33

                  y= 33-10

                     =23

let's check using the second equation :

            (10*15)+(23*7) = 311

that is true

so :

  •  the number of adults is 10
  • the number of kids is 23
You might be interested in
Somebody who knows how to do this?? plz answer all the questions correctly thanks!
Ksju [112]

Answer:

a) 5/21

b) 4/21

c) 4/21

d) 8/21

Step-by-step explanation:

total number of coins: 21

a) number if dollars: 5

therefore fraction is 5/21

b) number of quarters: 4

therefore fraction is 4/21

c) number of dimes: 4

therefore fraction is 4/21

d) number of nickels: 8

therefore fraction is 8/21

4 0
3 years ago
Beneze recipe for granola bars close for 3 1/2 cups of oatmeal he only has 16 cup scoop how many scoops of oatmeal he need for t
LUCKY_DIMON [66]
16/3 1/2= 7/32. so you would measure 7/32 on the 16 cup scoop
7 0
3 years ago
Drag a reason to each box to complete this proof.<br><br> If 12=13x+5 , then x = 21.
Ainat [17]
<span><span>I think the answers are:

Statement          Reason</span><span><span><span>  
<span>12=<span>13</span>x+5          </span></span>Given</span><span><span>  
<span>7=<span>13</span>x          </span></span>Subtraction Property of Equality</span><span><span> 
21 = x          </span>Multiplication Property of Equality</span><span><span> 
x = 21          </span><span>Symmetric Property of Equality 

By the way, I'm doing the same exam for Geometry as well. There's a lot of proof questions on there which I'm not good at doing for the reasoning part. If you finish the exam before I do, maybe you can message me what the answers are for some of the questions on there so I know if my answers for the questions are incorrect or not. 

Besides that, hope the answer above is correct for you. 

<em>~ ShadowXReaper069</em></span></span></span></span>
5 0
3 years ago
Read 2 more answers
Which is more valuable a pile of pennies equaling your weight or a stack of quarters equaling your height?
11Alexandr11 [23.1K]

Answer:

A pile of pennies

Step-by-step explanation:

7 0
3 years ago
Two ants, red ant and black ant, creeping along lines in 3-space. At time t, red ant is at point on the line
mylen [45]
A. The distance between the red ant and the black ant is five units.

To represent the red ant,
xr = 3 - t 
yr = 2 + 2 t 
zr = 6 + 2 t 

To represent the black ant, 
xb = t/2 
yb = 2 + 3 t 
zb = 2 + t 

To calculate,
at t = 0 
xb - xr = -3 
yb - yr - 2-2 = 0 
zb - zr = 2-6 = -4 
Therefore,
d = √(9+16) = √(25) = 5

b. There will be no collision between the two ants.

To calculate,
3 - t = t/2
6 - 2t = t
6 = 3t
t = 2 

If t = 2,
2 + 2*2 = 2 + 3*2
4 0
3 years ago
Other questions:
  • In which step did karina make an error
    10·1 answer
  • If a bus travels 20 km in 30 minutes. What is the average speed of the bus?
    6·2 answers
  • Find the value of x.<br> х= 2<br> х= 3<br> х= 33<br> х= 52
    8·1 answer
  • 42 students arrived at the school dance after it started. in all 78 students attended. write and solve an equation to find how m
    15·1 answer
  • 2.0) 864= equals what?
    5·1 answer
  • true or false if you have poor credit card, the company will conduct a history check of your assests ,religion and nationality ?
    11·2 answers
  • Evaluate the piece wise-defined function for the given values of x by matching the domain values with the range values
    12·2 answers
  • Any of ya'll good in Maths??​
    12·1 answer
  • The volume of a sphere is 1436.8 ft· Find the radius of the sphere.
    10·1 answer
  • I WILL GIVE 20 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS AND EXPLAIN WHY THAT IS THE ANSWER
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!