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
alexandr402 [8]
2 years ago
15

Quick sell outlet sold a total of 40 televisions, each of which was either a model p television or a model q television. each mo

del p television sold for $p and each model q sold for $q. the average (arithmetic mean) selling price of the 40 televisions was $141. how many of the 40 televisions were model p televisions?
1) the model p televisions sold for $30 less than the model q televisions
2) either p=120 or q=120
Mathematics
2 answers:
saw5 [17]2 years ago
3 0

Answer:

The number of the television sets that is model p is 12

Step-by-step explanation:

Here we have total number of television sold = 40

The model p televisions sold for $30 less than the model q televisions

That is $P = $q - $30

Therefore

Let the quantity of the model p sold be X

Let the quantity of the model q sold be X

Therefore

x + y = 40

Total cost of the television = 40 * 141 = $5640

Therefore, 120*x + 90*y = 5640

Plugging in x = 40 - y in the above equation we get

4800 - 30y = 5640 or

y   = -28 and

x = 68

If we put y = 40 - x we get

30x + 3600 = 5640  

If we put

120*x + 150*y = 5640.........(3)

we get

x = 12 and y = 28

Therefore, since the model p sold for $30 less than the model q, from the solution of equation (3) the number of the television sets that is model p = 12

Stells [14]2 years ago
3 0

Answer: 12 of the 40 televisions were model p televisions

Step-by-step explanation:

Revenue = price × quantity

Let x represent the number of the model p TV sold

The number of model q TV sold would be 40 - x

Revenue from model p TV sold is

px

Revenue from model q TV sold is

(40 - x)q

Total revenue = px + (40 - x)q

The formula for determining average price is expressed as

Average price = total revenue/total number of TV sold.

The average (arithmetic mean) selling price of the 40 televisions was $141. This means that

141 = (px + (40 - x)q)/40

141 × 40 = px + (40 - x)q

5640 = px + (40 - x)q

p = q - 30

5640 = x(q - 30) + (40 - x)q

5640 = xq - 30x + 40q - xq

5640 = - 30x + 40q

If q = 120, then

5640 = - 30x + 40 × 120

5640 = - 30x + 4800

5640 - 4800 = - 30x

840 = - 30x

x = 840/- 30 = - 28

since x cannot be negative, then q is not equal to 120

Again,

5640 = px + (40 - x)q

If q = 30 + p, then

5640 = px + (40 - x)(30 + p)

5640 = px + 1200 + 40p - 30x - px

5640 = 1200 + 40p - 30x

Therefore,

If p = 120, then

5640 = 1200 + 40 × 120 - 30x

5640 = 6000 - 30x

30x = 6000 - 5640

30x = 360

x = 360/30

x = 12

You might be interested in
The mean SAT score in mathematics, M, is 600. The standard deviation of these scores is 48. A special preparation course claims
kupik [55]

Answer:

Step-by-step explanation:

The mean SAT score is \mu=600, we are going to call it \mu since it's the "true" mean

The standard deviation (we are going to call it \sigma) is

\sigma=48

Next they draw a random sample of n=70 students, and they got a mean score (denoted by \bar x) of \bar x=613

The test then boils down to the question if the score of 613 obtained by the students in the sample is statistically bigger that the "true" mean of 600.

- So the Null Hypothesis H_0:\bar x \geq \mu

- The alternative would be then the opposite H_0:\bar x < \mu

The test statistic for this type of test takes the form

t=\frac{| \mu -\bar x |} {\sigma/\sqrt{n}}

and this test statistic follows a normal distribution. This last part is quite important because it will tell us where to look for the critical value. The problem ask for a 0.05 significance level. Looking at the normal distribution table, the critical value that leaves .05% in the upper tail is 1.645.

With this we can then replace the values in the test statistic and compare it to the critical value of 1.645.

t=\frac{| \mu -\bar x |} {\sigma/\sqrt{n}}\\\\= \frac{| 600-613 |}{48/\sqrt(70}}\\\\= \frac{| 13 |}{48/8.367}\\\\= \frac{| 13 |}{5.737}\\\\=2.266\\

<h3>since 2.266>1.645 we  can reject the null hypothesis.</h3>
6 0
3 years ago
Read 2 more answers
Ehelp help help help help
IrinaVladis [17]

Answer:

The ratio of red to green crayons is 18 to 24 which can be reduced to 3 to 4.

Step-by-step explanation:

5 0
2 years ago
Easy geometry question about rhombus/measures :))
OLEGan [10]

Answer:

∠1 = 51

∠2= 51

∠3= 39

∠4= 51

3 0
2 years ago
Use an angle sum identity to derive each double-angle identity.
Simora [160]
\ [cos(2\theta)]'=(2cos^2\theta-1)'=2(cos^2\theta)'-(1)'\\\\=2\cdot2cos\theta\cdot(-sin\theta)-0=-2\cdot2sin\theta cos\theta=\boxed{-2sin2\theta}\\\\Used:\\\ [f(x)-g(x)]'=f'(x)-g'(x)\\\{f[g(x)]\}'=f'[g(x)]\cdot g'(x)\\(cosx)'=-sinx\\sin2x=2sinxcosx
4 0
3 years ago
Three words that are synonyms to roots
grigory [225]

Answer:

Essence

Stem

Seed

Step-by-step explanation:

4 0
3 years ago
Other questions:
  • twice the difference of a numbrr and 8 is equal to 2.twice the difference of a number and 8 is equal to 2 ​
    5·1 answer
  • The length of a rectangle is 6 times longer than the width. The perimeter is 42. What is the width?
    6·1 answer
  • Please answer this I need help! There are 90 people going on the field trip. The budget allows for $542.94 total for tickets to
    15·1 answer
  • Someone please help me
    14·1 answer
  • A pair of jeans is on sale for 25% off the original price. Which expression represents the sale price ? If the original price of
    7·1 answer
  • AB = x + 2
    12·1 answer
  • T divided by 5.4 equals 9.01 solve for t
    14·1 answer
  • What is the equation of a line that passes through the given point and is parallel to the given line. (-3, 2) and y = -4
    9·1 answer
  • Answer the following. Solve for X
    7·2 answers
  • How many 3-digit numbers less than 500 can be formed from 0, 2, 4, 6, if repetition of digits is allowed?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!