A jar contains n nickels and d dimes there are 30 coins in the jar and the total value of the coins is $2.10 Set up and solve a system of equations to find how many nickels and how many dimes are in the jar

12 dimes and 18 nickels

Step-by-step explanation:

Equations given by word problem:

n + d = 30

0.05n + 0.1d = 2.10

How I solved them:

d = 30 - n

0.05n + 0.1 (30 - n) = 2.10

0.05n + 3 - 0.1n = 2.10

-0.05n = -.09

Divide both sides by - 0.05

n = 18

18 + d = 30

d = 12

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