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
eimsori [14]
3 years ago
12

Katie has a collection of nickels dimes and quarters with a total value of $4.20 there are 7 more dimes than nickels and six mor

e quarters and nickels how many of each coin does she have
Mathematics
1 answer:
Aneli [31]3 years ago
7 0
Katie, Let the number of nickles = N Since there are 7 more dimes than nickles, the number of dimes D = N + 7 Since there are 4 more quarters than nickles, the number of quarters Q = N + 4 Since quarters = $0.25, dimes = $0.10, and nickles = $0.05 and all added together = $4.90 ⇒  0.25·Q + 0.10·D + 0.05·N = 4.90 Now multiply through by 100 to eliminate the decimal: 25Q + 10D + 5N = 490 Substitute for Q and D 25(N+4) + 10(N+7) + 5N = 490 25N + 10N + 5N +100 +70 = 490 40N + 170 = 490 ⇒ 40N = 320 ⇒ N = 320/40 N = 8, D = N+7 = 15 Q = N+4 = 12 Check: 25(12) + 10(15) + 5(8) = 300 + 150 + 40 = 490
You might be interested in
Which comparison below is a true statement
Alinara [238K]
C is the true statement
7 0
3 years ago
What other multiplication facts can be used to find the product of 5×6?
Radda [10]
5*6 can be expressed as 5+5+5+5+5+5
4 0
2 years ago
Read 2 more answers
MATH HELP!!!!!!!!! PLS PLS I need help
Ahat [919]

Answer:

2 7/13

Step-by-step explanation:

6 0
2 years ago
Marco is making a kite, using sticks for its diagonals. One stick is 2 feet long and the other is 3 feet long. How much material
Marat540 [252]

Answer:

Marco will need 3\ ft^{2} of material to make the kite

Step-by-step explanation:

we know that

To know how much material Marco will need to make the kite, the area must be calculated.

Remember that the area of the kite is equal to

A=\frac{1}{2}[d1*d2]

where

d1 and d2 are the diagonals of the kite

we have

d1=2\ ft

d2=3\ ft

substitute

A=\frac{1}{2}[2*3]=3\ ft^{2}

3 0
3 years ago
Read 2 more answers
Jillian owns 60% of the stock
Amiraneli [1.4K]

Answer:

Jillian has 720 shares

Step-by-step explanation:

Find 60% 1,200 shares

Convert 60% to decimal.

0.6

Multiply to find 60% of 1,200

0.6 x 1,200 = 720

720 shares

8 0
2 years ago
Other questions:
  • Simplify 15y^-7/18y^-3 Assume y≠0
    7·2 answers
  • Eight minus two times a number is equal to the number plus 17. find the number
    12·1 answer
  • 100 POINTS!!! I need help asap
    5·2 answers
  • if ol bisects straight < nop and bisects < nlp, which of the following is not necessarily true
    12·1 answer
  • Which expression is equivalent to (2x^2 +3)(x+4)???​
    5·2 answers
  • there are 36 pupils in a class 4/9 wear digital watches.how many pupils in the class do.not wear digital watches​
    6·2 answers
  • 7. Use the table to answer the following question.
    7·1 answer
  • Read the scenario. 1. The temperature at 6 A.M. was -5°F. By noon the temperature had risen by 5°F. What was the temperature at
    7·2 answers
  • A clerk at the butcher shop is six feet tall and wears 10 shoes . What does he weigh
    7·1 answer
  • Select the correct answer.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!