tiffanyliu1 tiffanyliu1

23-02-2019
Mathematics

contestada

A box of 80 coins, consisting of only nickels and dimes, is worth 7 dollars and 80 cents. Find the number of nickels.

Respuesta :

taylorm2088 taylorm2088

23-02-2019

4 nickles
Explanation:
80=N+D
7.80=0.05N + 0.1D

D=80-N

7.80=0.05N + 0.1(80-N)
7.80=0.05N + 8 - 0.1N
0.1N + 7.80 = 8 + 0.05N
0.05N = 8-7.80
0.05N = 0.2
N= 4

Answer Link

Otras preguntas

What does x equal ? This is similarity

This image shows the various forces acting on a block of rock situated on a rock slope. What does arrow 4 represent?

Explain why hypersensitivity developes

While all cells in an organism contain the same genetic information explain how genes are both expressed and regulated in different ways

Read the incomplete list of steps below, which shows how the excretory system maintains homeostasis. 1.nephrons in the kidney remove waste and necessary materia

Please help me on this it a about to be due

Which piece of evidence, if true, would best support this claim? Removing animals from the wild and placing them in zoos can contribute to the endangerment of t

The dollar amount of an insured's financial injury by death or damage that the insurer is financially responsible; to lose money in an investment.

When escaping domestic violence, which steps are part of the decision-making process? Select three options. Call a support line. Make a decision about whether t

What is the missing length?