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

whats the most accurate estimation of 65+77

please explain how to solve this On Monday,it took Helen 3 hours to do a page of science homework exercises.The next day she did the same number of exercises

which of the following represents the most accurate estimation of 38+23

''Life in a city is more rewarding than life outside a city."List two or three arguments in favor of this opinion and two or three arguments opposing this opini

please explain how to solve this On Monday,it took Helen 3 hours to do a page of science homework exercises.The next day she did the same number of exercises

which of the following represents the most accurate estimation of 38+23

please explain how to solve this On Monday,it took Helen 3 hours to do a page of science homework exercises.The next day she did the same number of exercises

why did people immigrate to the United States in the late 1800s?

whats the most accurate estimation of 65+77

why did people immigrate to the United States in the late 1800s?