SOLUTION: Mary has $2.15 in a jar that is entirely made up of dimes and nickles. there are 30 coins total. How many dimes and nickles does she have. I can guess and check this problem, b

Question 655900: Mary has $2.15 in a jar that is entirely made up of dimes and nickles. there are 30 coins total. How many dimes and nickles does she have.
I can guess and check this problem, but how do I put this into an equation and solve? Thanks
Found 2 solutions by Alan3354, sharks415:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Mary has $2.15 in a jar that is entirely made up of dimes and nickles. there are 30 coins total. How many dimes and nickles does she have.
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d + n = 30
10d + 5n = 215

Answer by sharks415(1) (Show Source): You can put this solution on YOUR website!
d+n=215
10d+5(30-d)=215
10d+150-5d=215
10d-5d
5d+150=215
-150 -150
5d/5=65/5
d=13
30-13=17
n=17
10(13)+5(17)=215
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