MATH HELP PLEASE
posted by mary .
Bill has 30 coins, some nickels some dimes. They equal $2.10. How many nickels are there? What is the equasion used to solve this problem? When I solve it, I get 4.3 nickels, but how can there be .3? Please help me solve
I posted the two equations for this about an hour ago. Show your work and I'll find your error.
N + D = 30
5N + 10D = 210
Multiply the first by 5 and subtract from the second and you will have your answers.

n=5
d=28