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
nataly862011 [7]
3 years ago
7

10

Mathematics
1 answer:
sveta [45]3 years ago
8 0

This question was not written properly

Complete Question

Steve has 54 stamps in his collection of 13 cent, 29 cent, and 45 cent stamps, totaling a value of $15.98. If the number of 13 cent stamps is doubled, the new total value of his stamp collection would be $17.80. Find the number of each type of stamp in his collection.

Answer:

a) The number of 13 cent = 14

b) The number of 29 cent = 24

c) The number of 45 cent = 16

Step-by-step explanation:

We are told he has 54 stamps in total.

These stamps are;13 cent, 29 cent, and 45 cent stamps.

Let's

Number of 13 cent = a

Number of 29 cent = b

Number of 45 cent = c

Hence,

a + b + c = 54........... Equation 1

The total value of the 3 stamps are $15.98.

1 cent = $0.01

We have

0.13a + 0.29b + 0.45c= $15.98 ......... Equation 2

We know from the question that:

13 cent stamps is doubled, the new total value of his stamp collection would be $17.80.

Therefore

2(0.13a) + 0.29b + 0.45c = 17.8

0.26a + 0.29b + 0.45c = 17.8 ......... Equation 3

Combining Equation 2 and 3 together

0.13a + 0.29b + 0.45c= 15.98 ......... Equation 2

0.26a + 0.29b + 0.45c = 17.8 ......... Equation 3

We eliminate b and c by Subtracting Equation 3 from 3

0.13a = 1.82

a = 1.82/0.13

a = 14

a + b + c = 54........... Equation 1

Since a = 14

14 + b + c = 54

b + c = 54 - 14

b + c = 40

c = 40 - b

Substitute 40 - b for c and 14 for a is Equation 2

0.13a + 0.29b + 0.45c= 15.98 ......... Equation 2

0.13(14 ) + 0.29b + 0.45(40 - b) = 15.98

= 1.82 + 0.29b + 18 - 0.45b = 15.98

Collect like terms

1.82 + 18 - 15.98 = 0.45b - 0.29b

3.84 = 0.16b

b = 3.84/0.16

b = 24

Hence: Solving for c

a + b + c = 54........... Equation 1

14 + 24 + c = 54

38 + c = 54

c = 54 - 38

c = 16

Therefore,

The number of 13 cent = 14

The number of 29 cent = 24

The number of 45 cent = 16

You might be interested in
Joan is 5 years older than Ellen, and 3 years ago their sum of their ages is 17, in how many years will Joan be 21?
mariarad [96]

Answer:

7

Step-by-step explanation:

5 0
2 years ago
Which of the following could be true if y ≤ -75?
Charra [1.4K]

Answer:-74

Step-by-step explanation: When you are in the megatives, less is more! So -74 is actually greater then -75

6 0
3 years ago
nk, Inc. has 40,000 shares of stock outstanding. The company declares dividends of $120,000. What is the dividend per share of s
Angelina_Jolie [31]
To find the he dividend per share of stock,we can divide the dividends by the total amount of
share:

120000÷40000
=$3

If Tim Worker owns 45 shares of stock, his share of the declared dividends would be:

3×45
=$135

Hope it helps!
5 0
3 years ago
A group of 100 students took a quiz. Their average score was 76 points. If the average score for the boys was 80 points and the
sveta [45]

Answer:

The number of girls participated in quiz is 40 .

Step-by-step explanation:

Given as :

Total number of students took quiz = 100

Average score of 100 students = 76 points

The Average score of boys = 80 points

The Average score of girls = 70 points

Let The number of boys participated in quiz = b

Let The number of girls participate in quiz = g

Now, According to question'

Total number of students took quiz = number of boys participated in quiz + number of girls participated in quiz

Or, b + g = 100           ........A

<u>Again</u>

∵ Average score of 100 students = 76 points

∴ Total score of 100 students = 76 × 100 = 7600

So, Average score of boys × number of boys participated + Average score of girls × number of girls participated = Total score of 100 students

Or, b × 80 + g × 70 = 7600

Or, 80 b + 70 g = 7600             .........B

Now, Solving equation A and B

(80 b + 70 g ) - 70 ×( b + g ) = 7600 - 70 × 100

I.e (80 b - 70 b) + (70 g - 70 g) = 7600 - 7000

Or, 10 b + 0 = 600

∴  b = \dfrac{600}{10}

i.e b = 60

So, The number of boys participated in quiz = b = 60

Put the value of b into eq A

∵ b + g = 100

So, g = 100 - b

Or, g = 100 - 60

i.e g = 40

So, The number of girls participated in quiz = g = 40

Hence, The number of girls participated in quiz is 40 . Answer

6 0
3 years ago
600 centimeters__5 meters
uranmaximum [27]
600 centimeters > 5 meters
4 0
3 years ago
Other questions:
  • WXYZ is a parallelogram. Name an angle congruent to wzy
    6·1 answer
  • To make a dark orange color, Ron mixes 3 ounces of red paint with 2 ounces of yellow paint. Write the ratio of red paint with ye
    7·2 answers
  • when justin goes to work he drives at an average speed of 65 mph. it takes about 1 hour and 30 minutes for justin to arrive at w
    15·1 answer
  • 800 calories for7 serving of pasties blank calories per serving
    11·2 answers
  • On a number line, a number, b, is located the same distance from 0 as another number, a, but in the opposite direction. The
    5·1 answer
  • What metric unit would you use to measure the length of a football field?
    15·1 answer
  • Write the equation of the hyperbola centered at the origin, with a focus at (10, 0) and directrix at x = 125/10
    5·1 answer
  • Please help worth alot of pts just 1 question
    6·2 answers
  • One of the roots of the equation 27x^2 + bx + 8 =0 is known to be the square of the other. Find b​
    9·1 answer
  • Question 6 of 10
    14·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!