Question

Martha has some nickels and dimes worth $6.25. She has three times as many nickels as dimes. How many nickels does she have?

Answer 1

75 nickels.

Explanation:

Here is the system of equations you can use:

0.05n+0.1d=6.25 (which can be converted to 5n+10d=625)

3d=n

5(3d)+10d=625

15d+10d=625

25d=625

d=25

3(25)=n

n=75