Monday
March 27, 2017

Post a New Question

Posted by on .

You have a total of 21 coins, all nickels and dimes. The total value is $1.70. Write and solve a system of equations to find the number of dimes d and the number of nickels n that you have.

I already wrote the equations: n+d=21 and 10d+5n=1.70. But I don't know how to solve it..

  • Math - ,

    You have a total of 21 coins, all nickels and dimes. The total value is $1.70. Write and solve a system of equations to find the number of dimes d and the number of nickels n that you have.

    I already wrote the equations: n+d=21 and 10d+5n=1.70. But I don't know how to solve it.

    1--n+d=21
    2--10d+5n=170
    3--From (1), d=21-n
    4--Substitute into (2) and solve for n and then d.

  • Math - ,

    i get it..thanks!

Answer This Question

First Name:
School Subject:
Answer:

Related Questions

More Related Questions

Post a New Question